Fix mqt sensor unit validation, fix openweather snapshot

Merge branch 'dev' into fix-microsign-alt1
Fix recorder tests
2025-06-01 19:55:41 +00:00 · 2025-06-01 20:14:12 +02:00 · 2025-06-01 17:33:52 +00:00 · 2025-05-28 13:36:46 +00:00 · 2025-05-28 13:36:46 +00:00 · 2025-05-28 13:36:46 +00:00
49 changed files with 830 additions and 213 deletions
@@ -61,7 +61,7 @@
      "display_pm_standard": {
        "name": "Display PM standard",
        "state": {
-          "ugm3": "µg/m³",
+          "ugm3": "μg/m³",
          "us_aqi": "US AQI"
        }
      },
@@ -92,7 +92,7 @@ SENSOR_DESCRIPTIONS = {
        key="radiation_rate",
        translation_key="radiation_rate",
        name="Radiation Dose Rate",
-        native_unit_of_measurement="μSv/h",
+        native_unit_of_measurement="μSv/h",  # "μ" == "\u03bc"
        state_class=SensorStateClass.MEASUREMENT,
        suggested_display_precision=2,
        scale=0.001,
@@ -72,7 +72,7 @@ SENSOR_DESCRIPTIONS = {
        key=str(BTHomeExtendedSensorDeviceClass.CHANNEL),
        state_class=SensorStateClass.MEASUREMENT,
    ),
-    # Conductivity (µS/cm)
+    # Conductivity (μS/cm)
    (
        BTHomeSensorDeviceClass.CONDUCTIVITY,
        Units.CONDUCTIVITY,
@@ -215,7 +215,7 @@ SENSOR_DESCRIPTIONS = {
        entity_category=EntityCategory.DIAGNOSTIC,
        entity_registry_enabled_default=False,
    ),
-    # PM10 (µg/m3)
+    # PM10 (μg/m3)
    (
        BTHomeSensorDeviceClass.PM10,
        Units.CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
@@ -225,7 +225,7 @@ SENSOR_DESCRIPTIONS = {
        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
        state_class=SensorStateClass.MEASUREMENT,
    ),
-    # PM2.5 (µg/m3)
+    # PM2.5 (μg/m3)
    (
        BTHomeSensorDeviceClass.PM25,
        Units.CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
@@ -318,7 +318,7 @@ SENSOR_DESCRIPTIONS = {
        key=str(BTHomeSensorDeviceClass.UV_INDEX),
        state_class=SensorStateClass.MEASUREMENT,
    ),
-    # Volatile organic Compounds (VOC) (µg/m3)
+    # Volatile organic Compounds (VOC) (μg/m3)
    (
        BTHomeSensorDeviceClass.VOLATILE_ORGANIC_COMPOUNDS,
        Units.CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
@@ -35,7 +35,7 @@ from .const import (

 UNIT_PREFIXES = [
    selector.SelectOptionDict(value="n", label="n (nano)"),
-    selector.SelectOptionDict(value="µ", label="µ (micro)"),
+    selector.SelectOptionDict(value="μ", label="μ (micro)"),
    selector.SelectOptionDict(value="m", label="m (milli)"),
    selector.SelectOptionDict(value="k", label="k (kilo)"),
    selector.SelectOptionDict(value="M", label="M (mega)"),
@@ -61,7 +61,7 @@ ATTR_SOURCE_ID = "source"
 UNIT_PREFIXES = {
    None: 1,
    "n": 1e-9,
-    "µ": 1e-6,
+    "μ": 1e-6,  # "μ" == "\u03bc"
    "m": 1e-3,
    "k": 1e3,
    "M": 1e6,
@@ -163,7 +163,7 @@ SENSORS: dict[str | None, SensorEntityDescription] = {
        native_unit_of_measurement=UnitOfSpeed.METERS_PER_SECOND,
        state_class=SensorStateClass.MEASUREMENT,
    ),
-    "µg/m³": SensorEntityDescription(
+    "μg/m³": SensorEntityDescription(
        key="concentration|microgram_per_cubic_meter",
        translation_key="concentration",
        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
@@ -105,7 +105,7 @@ SENSORS: Final[list[FytaSensorEntityDescription]] = [
    FytaSensorEntityDescription(
        key="light",
        translation_key="light",
-        native_unit_of_measurement="μmol/s⋅m²",
+        native_unit_of_measurement="μmol/s⋅m²",  # "μ" == "\u03bc"
        state_class=SensorStateClass.MEASUREMENT,
        value_fn=lambda plant: plant.light,
    ),
@@ -291,7 +291,7 @@ class NitrogenDioxideSensor(AirQualitySensor):
 class VolatileOrganicCompoundsSensor(AirQualitySensor):
    """Generate a VolatileOrganicCompoundsSensor accessory as VOCs sensor.

-    Sensor entity must return VOC in µg/m3.
+    Sensor entity must return VOC in μg/m3.
    """

    def create_services(self) -> None:
@@ -480,7 +480,7 @@ def temperature_to_states(temperature: float, unit: str) -> float:


 def density_to_air_quality(density: float) -> int:
-    """Map PM2.5 µg/m3 density to HomeKit AirQuality level."""
+    """Map PM2.5 μg/m3 density to HomeKit AirQuality level."""
    if density <= 9:  # US AQI 0-50 (HomeKit: Excellent)
        return 1
    if density <= 35.4:  # US AQI 51-100 (HomeKit: Good)
@@ -493,7 +493,7 @@ def density_to_air_quality(density: float) -> int:


 def density_to_air_quality_pm10(density: float) -> int:
-    """Map PM10 µg/m3 density to HomeKit AirQuality level."""
+    """Map PM10 μg/m3 density to HomeKit AirQuality level."""
    if density <= 54:  # US AQI 0-50 (HomeKit: Excellent)
        return 1
    if density <= 154:  # US AQI 51-100 (HomeKit: Good)
@@ -506,7 +506,7 @@ def density_to_air_quality_pm10(density: float) -> int:


 def density_to_air_quality_nitrogen_dioxide(density: float) -> int:
-    """Map nitrogen dioxide µg/m3 to HomeKit AirQuality level."""
+    """Map nitrogen dioxide μg/m3 to HomeKit AirQuality level."""
    if density <= 30:
        return 1
    if density <= 60:
@@ -519,7 +519,7 @@ def density_to_air_quality_nitrogen_dioxide(density: float) -> int:


 def density_to_air_quality_voc(density: float) -> int:
-    """Map VOCs µg/m3 to HomeKit AirQuality level.
+    """Map VOCs μg/m3 to HomeKit AirQuality level.

    The VOC mappings use the IAQ guidelines for Europe released by the WHO (World Health Organization).
    Referenced from Sensirion_Gas_Sensors_SGP3x_TVOC_Concept.pdf
@@ -16,6 +16,7 @@ from homeassistant.components.number import (
    NumberMode,
    RestoreNumber,
 )
+from homeassistant.components.sensor.recorder import EQUIVALENT_UNITS
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
    CONF_DEVICE_CLASS,
@@ -70,6 +71,13 @@ MQTT_NUMBER_ATTRIBUTES_BLOCKED = frozenset(

 def validate_config(config: ConfigType) -> ConfigType:
    """Validate that the configuration is valid, throws if it isn't."""
+    if (
+        CONF_UNIT_OF_MEASUREMENT in config
+        and (unit_of_measurement := config[CONF_UNIT_OF_MEASUREMENT])
+        in EQUIVALENT_UNITS
+    ):
+        config[CONF_UNIT_OF_MEASUREMENT] = EQUIVALENT_UNITS[unit_of_measurement]
+
    if config[CONF_MIN] > config[CONF_MAX]:
        raise vol.Invalid(f"{CONF_MAX} must be >= {CONF_MIN}")

@@ -21,6 +21,7 @@ from homeassistant.components.sensor import (
    SensorExtraStoredData,
    SensorStateClass,
 )
+from homeassistant.components.sensor.recorder import EQUIVALENT_UNITS
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
    CONF_DEVICE_CLASS,
@@ -129,9 +130,14 @@ def validate_sensor_state_and_device_class_config(config: ConfigType) -> ConfigT
            f"together with state class '{state_class}'"
        )

-    if (device_class := config.get(CONF_DEVICE_CLASS)) is None or (
-        unit_of_measurement := config.get(CONF_UNIT_OF_MEASUREMENT)
-    ) is None:
+    if (unit_of_measurement := config.get(CONF_UNIT_OF_MEASUREMENT)) is None:
+        return config
+
+    config[CONF_UNIT_OF_MEASUREMENT] = EQUIVALENT_UNITS.get(
+        unit_of_measurement, unit_of_measurement
+    )
+
+    if (device_class := config.get(CONF_DEVICE_CLASS)) is None:
        return config

    if (
@@ -31,6 +31,7 @@ from homeassistant.loader import async_suggest_report_issue
 from homeassistant.util.hass_dict import HassKey

 from .const import (  # noqa: F401
+    AMBIGUOUS_UNITS,
    ATTR_MAX,
    ATTR_MIN,
    ATTR_STEP,
@@ -367,6 +368,15 @@ class NumberEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
            return self.entity_description.native_unit_of_measurement
        return None

+    @final
+    @property
+    def __native_unit_of_measurement_compat(self) -> str | None:
+        """Process ambiguous units."""
+        native_unit_of_measurement = self.native_unit_of_measurement
+        return AMBIGUOUS_UNITS.get(
+            native_unit_of_measurement, native_unit_of_measurement
+        )
+
    @property
    @final
    def unit_of_measurement(self) -> str | None:
@@ -374,7 +384,7 @@ class NumberEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        if self._number_option_unit_of_measurement:
            return self._number_option_unit_of_measurement

-        native_unit_of_measurement = self.native_unit_of_measurement
+        native_unit_of_measurement = self.__native_unit_of_measurement_compat
        # device_class is checked after native_unit_of_measurement since most
        # of the time we can avoid the device_class check
        if (
@@ -441,7 +451,7 @@ class NumberEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        if device_class not in UNIT_CONVERTERS:
            return value

-        native_unit_of_measurement = self.native_unit_of_measurement
+        native_unit_of_measurement = self.__native_unit_of_measurement_compat
        unit_of_measurement = self.unit_of_measurement
        if native_unit_of_measurement != unit_of_measurement:
            if TYPE_CHECKING:
@@ -470,7 +480,7 @@ class NumberEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        if value is None or (device_class := self.device_class) not in UNIT_CONVERTERS:
            return value

-        native_unit_of_measurement = self.native_unit_of_measurement
+        native_unit_of_measurement = self.__native_unit_of_measurement_compat
        unit_of_measurement = self.unit_of_measurement
        if native_unit_of_measurement != unit_of_measurement:
            if TYPE_CHECKING:
@@ -493,7 +503,7 @@ class NumberEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
            (number_options := self.registry_entry.options.get(DOMAIN))
            and (custom_unit := number_options.get(CONF_UNIT_OF_MEASUREMENT))
            and (device_class := self.device_class) in UNIT_CONVERTERS
-            and self.native_unit_of_measurement
+            and self.__native_unit_of_measurement_compat
            in UNIT_CONVERTERS[device_class].VALID_UNITS
            and custom_unit in UNIT_CONVERTERS[device_class].VALID_UNITS
        ):
@@ -8,6 +8,7 @@ from typing import Final
 import voluptuous as vol

 from homeassistant.const import (
+    CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT,
    CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
    CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
    CONCENTRATION_PARTS_PER_BILLION,
@@ -130,7 +131,7 @@ class NumberDeviceClass(StrEnum):
    CONDUCTIVITY = "conductivity"
    """Conductivity.

-    Unit of measurement: `S/cm`, `mS/cm`, `µS/cm`
+    Unit of measurement: `S/cm`, `mS/cm`, `μS/cm`
    """

    CURRENT = "current"
@@ -162,7 +163,7 @@ class NumberDeviceClass(StrEnum):
    DURATION = "duration"
    """Fixed duration.

-    Unit of measurement: `d`, `h`, `min`, `s`, `ms`, `µs`
+    Unit of measurement: `d`, `h`, `min`, `s`, `ms`, `μs`
    """

    ENERGY = "energy"
@@ -240,25 +241,25 @@ class NumberDeviceClass(StrEnum):
    NITROGEN_DIOXIDE = "nitrogen_dioxide"
    """Amount of NO2.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    NITROGEN_MONOXIDE = "nitrogen_monoxide"
    """Amount of NO.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    NITROUS_OXIDE = "nitrous_oxide"
    """Amount of N2O.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    OZONE = "ozone"
    """Amount of O3.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    PH = "ph"
@@ -270,19 +271,19 @@ class NumberDeviceClass(StrEnum):
    PM1 = "pm1"
    """Particulate matter <= 1 μm.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    PM10 = "pm10"
    """Particulate matter <= 10 μm.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    PM25 = "pm25"
    """Particulate matter <= 2.5 μm.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    POWER_FACTOR = "power_factor"
@@ -359,7 +360,7 @@ class NumberDeviceClass(StrEnum):
    SULPHUR_DIOXIDE = "sulphur_dioxide"
    """Amount of SO2.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    TEMPERATURE = "temperature"
@@ -371,7 +372,7 @@ class NumberDeviceClass(StrEnum):
    VOLATILE_ORGANIC_COMPOUNDS = "volatile_organic_compounds"
    """Amount of VOC.

-    Unit of measurement: `µg/m³`, `mg/m³`
+    Unit of measurement: `μg/m³`, `mg/m³`
    """

    VOLATILE_ORGANIC_COMPOUNDS_PARTS = "volatile_organic_compounds_parts"
@@ -383,7 +384,7 @@ class NumberDeviceClass(StrEnum):
    VOLTAGE = "voltage"
    """Voltage.

-    Unit of measurement: `V`, `mV`, `µV`, `kV`, `MV`
+    Unit of measurement: `V`, `mV`, `μV`, `kV`, `MV`
    """

    VOLUME = "volume"
@@ -430,7 +431,7 @@ class NumberDeviceClass(StrEnum):
    Weight is used instead of mass to fit with every day language.

    Unit of measurement: `MASS_*` units
-    - SI / metric: `µg`, `mg`, `g`, `kg`
+    - SI / metric: `μg`, `mg`, `g`, `kg`
    - USCS / imperial: `oz`, `lb`
    """

@@ -546,3 +547,14 @@ UNIT_CONVERTERS: dict[NumberDeviceClass, type[BaseUnitConverter]] = {
    NumberDeviceClass.TEMPERATURE: TemperatureConverter,
    NumberDeviceClass.VOLUME_FLOW_RATE: VolumeFlowRateConverter,
 }
+
+AMBIGUOUS_UNITS: dict[str | None, str] = {
+    "\u00b5Sv/h": "μSv/h",  # aranet: radiation rate
+    "\u00b5S/cm": UnitOfConductivity.MICROSIEMENS_PER_CM,
+    "\u00b5V": UnitOfElectricPotential.MICROVOLT,
+    "\u00b5g/ft³": CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT,
+    "\u00b5g/m³": CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+    "\u00b5mol/s⋅m²": "μmol/s⋅m²",  # fyta: light
+    "\u00b5g": UnitOfMass.MICROGRAMS,
+    "\u00b5s": UnitOfTime.MICROSECONDS,
+}
@@ -366,6 +366,7 @@ class PrometheusMetrics:

    @staticmethod
    def _sanitize_metric_name(metric: str) -> str:
+        metric.replace("\u03bc", "\u00b5")
        return "".join(
            [c if c in ALLOWED_METRIC_CHARS else f"u{hex(ord(c))}" for c in metric]
        )
@@ -747,6 +748,9 @@ class PrometheusMetrics:
            PERCENTAGE: "percent",
        }
        default = unit.replace("/", "_per_")
+        # Unit conversion for CONCENTRATION_MICROGRAMS_PER_CUBIC_METER "μg/m³"
+        # "μ" == "\u03bc" but the API uses "\u00b5"
+        default = default.replace("\u03bc", "\u00b5")
        default = default.lower()
        return units.get(unit, default)

@@ -263,7 +263,7 @@ def correct_db_schema_precision(
        )

        precision_columns = _get_precision_column_types(table_object)
-        # Attempt to convert timestamp columns to µs precision
+        # Attempt to convert timestamp columns to μs precision
        session_maker = instance.get_session
        engine = instance.engine
        assert engine is not None, "Engine should be set"
@@ -34,6 +34,7 @@ from homeassistant.util.enum import try_parse_enum
 from homeassistant.util.hass_dict import HassKey

 from .const import (  # noqa: F401
+    AMBIGUOUS_UNITS,
    ATTR_LAST_RESET,
    ATTR_OPTIONS,
    ATTR_STATE_CLASS,
@@ -314,7 +315,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        return _numeric_state_expected(
            try_parse_enum(SensorDeviceClass, self.device_class),
            self.state_class,
-            self.native_unit_of_measurement,
+            self.__native_unit_of_measurement_compat,
            self.suggested_display_precision,
        )

@@ -366,7 +367,8 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        # Make sure we can convert the units
        if (
            (unit_converter := UNIT_CONVERTERS.get(self.device_class)) is None
-            or self.native_unit_of_measurement not in unit_converter.VALID_UNITS
+            or self.__native_unit_of_measurement_compat
+            not in unit_converter.VALID_UNITS
            or suggested_unit_of_measurement not in unit_converter.VALID_UNITS
        ):
            if not self._invalid_suggested_unit_of_measurement_reported:
@@ -387,7 +389,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        if suggested_unit_of_measurement is None:
            # Fallback to unit suggested by the unit conversion rules from device class
            suggested_unit_of_measurement = self.hass.config.units.get_converted_unit(
-                self.device_class, self.native_unit_of_measurement
+                self.device_class, self.__native_unit_of_measurement_compat
            )

        if suggested_unit_of_measurement is None and (
@@ -396,7 +398,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
            # If the device class is not known by the unit system but has a unit converter,
            # fall back to the unit suggested by the unit converter's unit class.
            suggested_unit_of_measurement = self.hass.config.units.get_converted_unit(
-                unit_converter.UNIT_CLASS, self.native_unit_of_measurement
+                unit_converter.UNIT_CLASS, self.__native_unit_of_measurement_compat
            )

        if suggested_unit_of_measurement is None:
@@ -468,6 +470,16 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
            return self.entity_description.native_unit_of_measurement
        return None

+    @final
+    @property
+    def __native_unit_of_measurement_compat(self) -> str | None:
+        """Process ambiguous units."""
+        native_unit_of_measurement = self.native_unit_of_measurement
+        return AMBIGUOUS_UNITS.get(
+            native_unit_of_measurement,
+            native_unit_of_measurement,
+        )
+
    @cached_property
    def suggested_unit_of_measurement(self) -> str | None:
        """Return the unit which should be used for the sensor's state.
@@ -503,7 +515,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
        if self._sensor_option_unit_of_measurement is not UNDEFINED:
            return self._sensor_option_unit_of_measurement

-        native_unit_of_measurement = self.native_unit_of_measurement
+        native_unit_of_measurement = self.__native_unit_of_measurement_compat

        # Second priority, for non registered entities: unit suggested by integration
        if not self.registry_entry and (
@@ -541,7 +553,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
    @override
    def state(self) -> Any:
        """Return the state of the sensor and perform unit conversions, if needed."""
-        native_unit_of_measurement = self.native_unit_of_measurement
+        native_unit_of_measurement = self.__native_unit_of_measurement_compat
        unit_of_measurement = self.unit_of_measurement
        value = self.native_value
        # For the sake of validation, we can ignore custom device classes
@@ -763,7 +775,8 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
            return display_precision

        default_unit_of_measurement = (
-            self.suggested_unit_of_measurement or self.native_unit_of_measurement
+            self.suggested_unit_of_measurement
+            or self.__native_unit_of_measurement_compat
        )
        if default_unit_of_measurement is None:
            return display_precision
@@ -841,7 +854,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
            (sensor_options := self.registry_entry.options.get(primary_key))
            and secondary_key in sensor_options
            and (device_class := self.device_class) in UNIT_CONVERTERS
-            and self.native_unit_of_measurement
+            and self.__native_unit_of_measurement_compat
            in UNIT_CONVERTERS[device_class].VALID_UNITS
            and (custom_unit := sensor_options[secondary_key])
            in UNIT_CONVERTERS[device_class].VALID_UNITS
@@ -8,6 +8,7 @@ from typing import Final
 import voluptuous as vol

 from homeassistant.const import (
+    CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT,
    CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
    CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER,
    CONCENTRATION_PARTS_PER_BILLION,
@@ -158,7 +159,7 @@ class SensorDeviceClass(StrEnum):
    CONDUCTIVITY = "conductivity"
    """Conductivity.

-    Unit of measurement: `S/cm`, `mS/cm`, `µS/cm`
+    Unit of measurement: `S/cm`, `mS/cm`, `μS/cm`
    """

    CURRENT = "current"
@@ -190,7 +191,7 @@ class SensorDeviceClass(StrEnum):
    DURATION = "duration"
    """Fixed duration.

-    Unit of measurement: `d`, `h`, `min`, `s`, `ms`, `µs`
+    Unit of measurement: `d`, `h`, `min`, `s`, `ms`, `μs`
    """

    ENERGY = "energy"
@@ -270,25 +271,25 @@ class SensorDeviceClass(StrEnum):
    NITROGEN_DIOXIDE = "nitrogen_dioxide"
    """Amount of NO2.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    NITROGEN_MONOXIDE = "nitrogen_monoxide"
    """Amount of NO.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    NITROUS_OXIDE = "nitrous_oxide"
    """Amount of N2O.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    OZONE = "ozone"
    """Amount of O3.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    PH = "ph"
@@ -300,19 +301,19 @@ class SensorDeviceClass(StrEnum):
    PM1 = "pm1"
    """Particulate matter <= 1 μm.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    PM10 = "pm10"
    """Particulate matter <= 10 μm.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    PM25 = "pm25"
    """Particulate matter <= 2.5 μm.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    POWER_FACTOR = "power_factor"
@@ -390,7 +391,7 @@ class SensorDeviceClass(StrEnum):
    SULPHUR_DIOXIDE = "sulphur_dioxide"
    """Amount of SO2.

-    Unit of measurement: `µg/m³`
+    Unit of measurement: `μg/m³`
    """

    TEMPERATURE = "temperature"
@@ -402,7 +403,7 @@ class SensorDeviceClass(StrEnum):
    VOLATILE_ORGANIC_COMPOUNDS = "volatile_organic_compounds"
    """Amount of VOC.

-    Unit of measurement: `µg/m³`, `mg/m³`
+    Unit of measurement: `μg/m³`, `mg/m³`
    """

    VOLATILE_ORGANIC_COMPOUNDS_PARTS = "volatile_organic_compounds_parts"
@@ -414,7 +415,7 @@ class SensorDeviceClass(StrEnum):
    VOLTAGE = "voltage"
    """Voltage.

-    Unit of measurement: `V`, `mV`, `µV`, `kV`, `MV`
+    Unit of measurement: `V`, `mV`, `μV`, `kV`, `MV`
    """

    VOLUME = "volume"
@@ -461,7 +462,7 @@ class SensorDeviceClass(StrEnum):
    Weight is used instead of mass to fit with every day language.

    Unit of measurement: `MASS_*` units
-    - SI / metric: `µg`, `mg`, `g`, `kg`
+    - SI / metric: `μg`, `mg`, `g`, `kg`
    - USCS / imperial: `oz`, `lb`
    """

@@ -770,3 +771,14 @@ DEVICE_CLASS_STATE_CLASSES: dict[SensorDeviceClass, set[SensorStateClass]] = {
 STATE_CLASS_UNITS: dict[SensorStateClass | str, set[type[StrEnum] | str | None]] = {
    SensorStateClass.MEASUREMENT_ANGLE: {DEGREE},
 }
+
+AMBIGUOUS_UNITS: dict[str | None, str] = {
+    "\u00b5Sv/h": "μSv/h",  # aranet: radiation rate
+    "\u00b5S/cm": UnitOfConductivity.MICROSIEMENS_PER_CM,
+    "\u00b5V": UnitOfElectricPotential.MICROVOLT,
+    "\u00b5g/ft³": CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT,
+    "\u00b5g/m³": CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+    "\u00b5mol/s⋅m²": "μmol/s⋅m²",  # fyta: light
+    "\u00b5g": UnitOfMass.MICROGRAMS,
+    "\u00b5s": UnitOfTime.MICROSECONDS,
+}
@@ -45,6 +45,7 @@ from homeassistant.util.enum import try_parse_enum
 from homeassistant.util.hass_dict import HassKey

 from .const import (
+    AMBIGUOUS_UNITS,
    ATTR_LAST_RESET,
    ATTR_STATE_CLASS,
    DOMAIN,
@@ -79,7 +80,7 @@ EQUIVALENT_UNITS = {
    "ft3": UnitOfVolume.CUBIC_FEET,
    "m3": UnitOfVolume.CUBIC_METERS,
    "ft³/m": UnitOfVolumeFlowRate.CUBIC_FEET_PER_MINUTE,
-}
+} | AMBIGUOUS_UNITS


 # Keep track of entities for which a warning about decreasing value has been logged
@@ -197,7 +197,7 @@ SENSOR_TYPES = (
        attribute=TMRW_ATTR_PRECIPITATION_TYPE,
        value_map=PrecipitationType,
    ),
-    # Data comes in as ppb, convert to µg/m^3
+    # Data comes in as ppb, convert to μg/m^3
    # Molecular weight of Ozone is 48
    TomorrowioSensorEntityDescription(
        key="ozone",
@@ -221,7 +221,7 @@ SENSOR_TYPES = (
        device_class=SensorDeviceClass.PM10,
        state_class=SensorStateClass.MEASUREMENT,
    ),
-    # Data comes in as ppb, convert to µg/m^3
+    # Data comes in as ppb, convert to μg/m^3
    # Molecular weight of Nitrogen Dioxide is 46.01
    TomorrowioSensorEntityDescription(
        key="nitrogen_dioxide",
@@ -240,7 +240,7 @@ SENSOR_TYPES = (
        device_class=SensorDeviceClass.CO,
        state_class=SensorStateClass.MEASUREMENT,
    ),
-    # Data comes in as ppb, convert to µg/m^3
+    # Data comes in as ppb, convert to μg/m^3
    # Molecular weight of Sulphur Dioxide is 64.07
    TomorrowioSensorEntityDescription(
        key="sulphur_dioxide",
@@ -496,7 +496,7 @@ UNITS = (
    ),
    UnitOfMeasurement(
        unit=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
-        aliases={"ug/m3", "µg/m3", "ug/m³"},
+        aliases={"ug/m3", "μg/m3", "\u00b5g/m3", "ug/m³"},
        device_classes={
            SensorDeviceClass.NITROGEN_DIOXIDE,
            SensorDeviceClass.NITROGEN_MONOXIDE,
@@ -664,7 +664,7 @@ class UnitOfElectricCurrent(StrEnum):
 class UnitOfElectricPotential(StrEnum):
    """Electric potential units."""

-    MICROVOLT = "µV"
+    MICROVOLT = "μV"  # "μ" == "\u03bc"
    MILLIVOLT = "mV"
    VOLT = "V"
    KILOVOLT = "kV"
@@ -693,7 +693,7 @@ class UnitOfTemperature(StrEnum):
 class UnitOfTime(StrEnum):
    """Time units."""

-    MICROSECONDS = "μs"
+    MICROSECONDS = "μs"  # "μ" == "\u03bc"
    MILLISECONDS = "ms"
    SECONDS = "s"
    MINUTES = "min"
@@ -814,7 +814,7 @@ class UnitOfMass(StrEnum):
    GRAMS = "g"
    KILOGRAMS = "kg"
    MILLIGRAMS = "mg"
-    MICROGRAMS = "µg"
+    MICROGRAMS = "μg"  # "μ" == "\u03bc"
    OUNCES = "oz"
    POUNDS = "lb"
    STONES = "st"
@@ -832,13 +832,13 @@ class UnitOfConductivity(
    """Conductivity units."""

    SIEMENS_PER_CM = "S/cm"
-    MICROSIEMENS_PER_CM = "µS/cm"
+    MICROSIEMENS_PER_CM = "μS/cm"  # "μ" == "\u03bc"
    MILLISIEMENS_PER_CM = "mS/cm"

    # Deprecated aliases
    SIEMENS = "S/cm"
    """Deprecated: Please use UnitOfConductivity.SIEMENS_PER_CM"""
-    MICROSIEMENS = "µS/cm"
+    MICROSIEMENS = "μS/cm"  # "μ" == "\u03bc"
    """Deprecated: Please use UnitOfConductivity.MICROSIEMENS_PER_CM"""
    MILLISIEMENS = "mS/cm"
    """Deprecated: Please use UnitOfConductivity.MILLISIEMENS_PER_CM"""
@@ -909,9 +909,9 @@ class UnitOfPrecipitationDepth(StrEnum):


 # Concentration units
-CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "µg/m³"
+CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "μg/m³"  # "μ" == "\u03bc"
 CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: Final = "mg/m³"
-CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT: Final = "μg/ft³"
+CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT: Final = "μg/ft³"  # "μ" == "\u03bc"
 CONCENTRATION_PARTS_PER_CUBIC_METER: Final = "p/m³"
 CONCENTRATION_PARTS_PER_MILLION: Final = "ppm"
 CONCENTRATION_PARTS_PER_BILLION: Final = "ppb"
@@ -0,0 +1,70 @@
+"""Plugin for checking correct micro unicode card is used."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from astroid import nodes
+from pylint.checkers import BaseChecker
+from pylint.lint import PyLinter
+
+
+class HassEnforceGreekMicroCharChecker(BaseChecker):
+    """Checker for micro char."""
+
+    name = "hass-enforce-greek-micro-char"
+    priority = -1
+    msgs = {
+        "W7452": (
+            "Constants with a micro unit prefix must encode mu as U+03BC (\u03bc), not as U+00B5 (\u00b5)",
+            "hass-enforce-greek-micro-char",
+            "According to [The Unicode Consortium](https://en.wikipedia.org/wiki/Micro-#Symbol_encoding_in_character_sets), the Greek letter character is preferred.",
+        ),
+    }
+    options = ()
+
+    def visit_annassign(self, node: nodes.AnnAssign) -> None:
+        """Check for micro char const or StrEnum with type annotations."""
+        self._do_micro_check(node.target, node)
+
+    def visit_assign(self, node: nodes.Assign) -> None:
+        """Check for micro char const without type annotations."""
+        for target in node.targets:
+            self._do_micro_check(target, node)
+
+    def _do_micro_check(
+        self, target: nodes.NodeNG, node: nodes.Assign | nodes.AnnAssign
+    ) -> None:
+        """Check const assignment is not containing ANSI micro char."""
+
+        def _check_const(node_const: nodes.Const | Any) -> bool:
+            if (
+                isinstance(node_const, nodes.Const)
+                and isinstance(node_const.value, str)
+                and "\u00b5" in node_const.value
+            ):
+                self.add_message(self.name, node=node)
+                return True
+            return False
+
+        # Check constant assignments
+        if (
+            isinstance(target, nodes.AssignName)
+            and isinstance(node.value, nodes.Const)
+            and _check_const(node.value)
+        ):
+            return
+
+        # Check dict with EntityDescription calls
+        if isinstance(target, nodes.AssignName) and isinstance(node.value, nodes.Dict):
+            for _, subnode in node.value.items:
+                if not isinstance(subnode, nodes.Call):
+                    continue
+                for keyword in subnode.keywords:
+                    if _check_const(keyword.value):
+                        return
+
+
+def register(linter: PyLinter) -> None:
+    """Register the checker."""
+    linter.register_checker(HassEnforceGreekMicroCharChecker(linter))
@@ -163,6 +163,7 @@ load-plugins = [
  "pylint.extensions.typing",
  "hass_decorator",
  "hass_enforce_class_module",
+  "hass_enforce_greek_micro_char",
  "hass_enforce_sorted_platforms",
  "hass_enforce_super_call",
  "hass_enforce_type_hints",
@@ -622,7 +622,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '84fce612f5b8-pm01',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[indoor][sensor.airgradient_pm1-state]
@@ -631,7 +631,7 @@
      'device_class': 'pm1',
      'friendly_name': 'Airgradient PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airgradient_pm1',
@@ -675,7 +675,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '84fce612f5b8-pm10',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[indoor][sensor.airgradient_pm10-state]
@@ -684,7 +684,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Airgradient PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airgradient_pm10',
@@ -728,7 +728,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '84fce612f5b8-pm02',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[indoor][sensor.airgradient_pm2_5-state]
@@ -737,7 +737,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Airgradient PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airgradient_pm2_5',
@@ -833,7 +833,7 @@
    'supported_features': 0,
    'translation_key': 'raw_pm02',
    'unique_id': '84fce612f5b8-pm02_raw',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[indoor][sensor.airgradient_raw_pm2_5-state]
@@ -842,7 +842,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Airgradient Raw PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airgradient_raw_pm2_5',
@@ -36,7 +36,7 @@
    'supported_features': 0,
    'translation_key': 'co',
    'unique_id': '123-456-co',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_carbon_monoxide-state]
@@ -47,7 +47,7 @@
      'limit': 4000,
      'percent': 4,
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_carbon_monoxide',
@@ -207,7 +207,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-456-no2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_nitrogen_dioxide-state]
@@ -219,7 +219,7 @@
      'limit': 25,
      'percent': 64,
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_nitrogen_dioxide',
@@ -266,7 +266,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-456-o3',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_ozone-state]
@@ -278,7 +278,7 @@
      'limit': 100,
      'percent': 42,
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_ozone',
@@ -325,7 +325,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-456-pm1',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_pm1-state]
@@ -335,7 +335,7 @@
      'device_class': 'pm1',
      'friendly_name': 'Home PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_pm1',
@@ -382,7 +382,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-456-pm10',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_pm10-state]
@@ -394,7 +394,7 @@
      'limit': 45,
      'percent': 14,
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_pm10',
@@ -441,7 +441,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-456-pm25',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_pm2_5-state]
@@ -453,7 +453,7 @@
      'limit': 15,
      'percent': 29,
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_pm2_5',
@@ -557,7 +557,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-456-so2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_sulphur_dioxide-state]
@@ -569,7 +569,7 @@
      'limit': 40,
      'percent': 35,
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_sulphur_dioxide',
@@ -144,7 +144,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'test-serial-number_PM10',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[entry_pm2_5]
@@ -181,7 +181,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'test-serial-number_PM25',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[entry_temperature]
@@ -314,7 +314,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Test Sensor PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.test_sensor_pm10',
@@ -330,7 +330,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Test Sensor PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.test_sensor_pm2_5',
@@ -253,14 +253,14 @@ _LOGGER = logging.getLogger(__name__)
                {
                    "sensor_entity": "sensor.test_device_18b2_pm10",
                    "friendly_name": "Test Device 18B2 Pm10",
-                    "unit_of_measurement": "µg/m³",
+                    "unit_of_measurement": "μg/m³",
                    "state_class": "measurement",
                    "expected_state": "7170",
                },
                {
                    "sensor_entity": "sensor.test_device_18b2_pm25",
                    "friendly_name": "Test Device 18B2 Pm25",
-                    "unit_of_measurement": "µg/m³",
+                    "unit_of_measurement": "μg/m³",
                    "state_class": "measurement",
                    "expected_state": "3090",
                },
@@ -296,7 +296,7 @@ _LOGGER = logging.getLogger(__name__)
                        "sensor.test_device_18b2_volatile_organic_compounds"
                    ),
                    "friendly_name": "Test Device 18B2 Volatile Organic Compounds",
-                    "unit_of_measurement": "µg/m³",
+                    "unit_of_measurement": "μg/m³",
                    "state_class": "measurement",
                    "expected_state": "307",
                },
@@ -607,14 +607,14 @@ async def test_v1_sensors(
                {
                    "sensor_entity": "sensor.test_device_18b2_pm10",
                    "friendly_name": "Test Device 18B2 Pm10",
-                    "unit_of_measurement": "µg/m³",
+                    "unit_of_measurement": "μg/m³",
                    "state_class": "measurement",
                    "expected_state": "7170",
                },
                {
                    "sensor_entity": "sensor.test_device_18b2_pm25",
                    "friendly_name": "Test Device 18B2 Pm25",
-                    "unit_of_measurement": "µg/m³",
+                    "unit_of_measurement": "μg/m³",
                    "state_class": "measurement",
                    "expected_state": "3090",
                },
@@ -650,7 +650,7 @@ async def test_v1_sensors(
                        "sensor.test_device_18b2_volatile_organic_compounds"
                    ),
                    "friendly_name": "Test Device 18B2 Volatile Organic Compounds",
-                    "unit_of_measurement": "µg/m³",
+                    "unit_of_measurement": "μg/m³",
                    "state_class": "measurement",
                    "expected_state": "307",
                },
@@ -829,7 +829,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'xx:xx:xx:xx:xx:xx:xx:xx-01-042a-particulate_matter_pm2_5',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload14-expected14][sensor.starkvind_airpurifier_pm25-state]
@@ -838,7 +838,7 @@
      'device_class': 'pm25',
      'friendly_name': 'STARKVIND AirPurifier PM25',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.starkvind_airpurifier_pm25',
@@ -1377,7 +1377,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00:00:00:00:00:00:00:01-02-0113-air_quality_formaldehyde',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload2-expected2][sensor.airquality_1_ch2o-state]
@@ -1386,7 +1386,7 @@
      'device_class': 'volatile_organic_compounds',
      'friendly_name': 'AirQuality 1 CH2O',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airquality_1_ch2o',
@@ -1483,7 +1483,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00:00:00:00:00:00:00:01-02-0113-air_quality_pm2_5',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload2-expected2][sensor.airquality_1_pm25-state]
@@ -1492,7 +1492,7 @@
      'device_class': 'pm25',
      'friendly_name': 'AirQuality 1 PM25',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airquality_1_pm25',
@@ -1699,7 +1699,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00:00:00:00:00:00:00:01-02-0113-air_quality_formaldehyde',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload3-expected3][sensor.airquality_1_ch2o-state]
@@ -1708,7 +1708,7 @@
      'device_class': 'volatile_organic_compounds',
      'friendly_name': 'AirQuality 1 CH2O',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airquality_1_ch2o',
@@ -1805,7 +1805,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00:00:00:00:00:00:00:01-02-0113-air_quality_pm2_5',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload3-expected3][sensor.airquality_1_pm25-state]
@@ -1814,7 +1814,7 @@
      'device_class': 'pm25',
      'friendly_name': 'AirQuality 1 PM25',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airquality_1_pm25',
@@ -1910,7 +1910,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00:00:00:00:00:00:00:01-02-0113-air_quality_formaldehyde',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload4-expected4][sensor.airquality_1_ch2o-state]
@@ -1919,7 +1919,7 @@
      'device_class': 'volatile_organic_compounds',
      'friendly_name': 'AirQuality 1 CH2O',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airquality_1_ch2o',
@@ -2016,7 +2016,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00:00:00:00:00:00:00:01-02-0113-air_quality_pm2_5',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[config_entry_options0-sensor_payload4-expected4][sensor.airquality_1_pm25-state]
@@ -2025,7 +2025,7 @@
      'device_class': 'pm25',
      'friendly_name': 'AirQuality 1 PM25',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.airquality_1_pm25',
@@ -103,7 +103,7 @@
    'supported_features': 0,
    'translation_key': 'c6h6',
    'unique_id': '123-c6h6',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_benzene-state]
@@ -112,7 +112,7 @@
      'attribution': 'Data provided by GIOŚ',
      'friendly_name': 'Home Benzene',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_benzene',
@@ -159,7 +159,7 @@
    'supported_features': 0,
    'translation_key': 'co',
    'unique_id': '123-co',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_carbon_monoxide-state]
@@ -168,7 +168,7 @@
      'attribution': 'Data provided by GIOŚ',
      'friendly_name': 'Home Carbon monoxide',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_carbon_monoxide',
@@ -215,7 +215,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-no2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_nitrogen_dioxide-state]
@@ -225,7 +225,7 @@
      'device_class': 'nitrogen_dioxide',
      'friendly_name': 'Home Nitrogen dioxide',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_nitrogen_dioxide',
@@ -339,7 +339,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-o3',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_ozone-state]
@@ -349,7 +349,7 @@
      'device_class': 'ozone',
      'friendly_name': 'Home Ozone',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_ozone',
@@ -463,7 +463,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-pm10',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_pm10-state]
@@ -473,7 +473,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Home PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_pm10',
@@ -587,7 +587,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-pm25',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_pm2_5-state]
@@ -597,7 +597,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Home PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_pm2_5',
@@ -711,7 +711,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '123-so2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.home_sulphur_dioxide-state]
@@ -721,7 +721,7 @@
      'device_class': 'sulphur_dioxide',
      'friendly_name': 'Home Sulphur dioxide',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.home_sulphur_dioxide',
@@ -183,7 +183,7 @@ async def test_gvh5106(hass: HomeAssistant) -> None:
    pm25_sensor_attributes = pm25_sensor.attributes
    assert pm25_sensor.state == "0"
    assert pm25_sensor_attributes[ATTR_FRIENDLY_NAME] == "H5106 4E05 Pm25"
-    assert pm25_sensor_attributes[ATTR_UNIT_OF_MEASUREMENT] == "µg/m³"
+    assert pm25_sensor_attributes[ATTR_UNIT_OF_MEASUREMENT] == "μg/m³"
    assert pm25_sensor_attributes[ATTR_STATE_CLASS] == "measurement"

    assert await hass.config_entries.async_unload(entry.entry_id)
@@ -365,14 +365,14 @@
            'supported_features': 0,
            'translation_key': None,
            'unique_id': '00:00:00:00:00:00_1_2576_2580',
-            'unit_of_measurement': 'µg/m³',
+            'unit_of_measurement': 'μg/m³',
          }),
          'state': dict({
            'attributes': dict({
              'device_class': 'pm25',
              'friendly_name': 'Airversa AP2 1808 PM2.5 Density',
              'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-              'unit_of_measurement': 'µg/m³',
+              'unit_of_measurement': 'μg/m³',
            }),
            'entity_id': 'sensor.airversa_ap2_1808_pm2_5_density',
            'state': '3.0',
@@ -95,7 +95,7 @@
    'supported_features': 0,
    'translation_key': <PinecilNumber.CALIBRATION_OFFSET: 'calibration_offset'>,
    'unique_id': 'c0:ff:ee:c0:ff:ee_calibration_offset',
-    'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'µV'>,
+    'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'μV'>,
  })
 # ---
 # name: test_state[number.pinecil_calibration_offset-state]
@@ -106,7 +106,7 @@
      'min': 100,
      'mode': <NumberMode.BOX: 'box'>,
      'step': 1,
-      'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'µV'>,
+      'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'μV'>,
    }),
    'context': <ANY>,
    'entity_id': 'number.pinecil_calibration_offset',
@@ -566,7 +566,7 @@
    'supported_features': 0,
    'translation_key': <PinecilSensor.TIP_VOLTAGE: 'tip_voltage'>,
    'unique_id': 'c0:ff:ee:c0:ff:ee_tip_voltage',
-    'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'µV'>,
+    'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'μV'>,
  })
 # ---
 # name: test_sensors[sensor.pinecil_raw_tip_voltage-state]
@@ -575,7 +575,7 @@
      'device_class': 'voltage',
      'friendly_name': 'Pinecil Raw tip voltage',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'µV'>,
+      'unit_of_measurement': <UnitOfElectricPotential.MICROVOLT: 'μV'>,
    }),
    'context': <ANY>,
    'entity_id': 'sensor.pinecil_raw_tip_voltage',
@@ -135,7 +135,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'MW2-2E247F93-B570-46A6-B827-920E9E10F966_pm1',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[sensor.test_air_conditioner_pm1-state]
@@ -144,7 +144,7 @@
      'device_class': 'pm1',
      'friendly_name': 'Test air conditioner PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.test_air_conditioner_pm1',
@@ -188,7 +188,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'MW2-2E247F93-B570-46A6-B827-920E9E10F966_pm10',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[sensor.test_air_conditioner_pm10-state]
@@ -197,7 +197,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Test air conditioner PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.test_air_conditioner_pm10',
@@ -241,7 +241,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'MW2-2E247F93-B570-46A6-B827-920E9E10F966_pm2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[sensor.test_air_conditioner_pm2_5-state]
@@ -250,7 +250,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Test air conditioner PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.test_air_conditioner_pm2_5',
@@ -468,7 +468,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00000000000004D2-000000000000008F-MatterNodeDevice-2-PM1Sensor-1068-0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[air_purifier][sensor.air_purifier_pm1-state]
@@ -477,7 +477,7 @@
      'device_class': 'pm1',
      'friendly_name': 'Air Purifier PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.air_purifier_pm1',
@@ -521,7 +521,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00000000000004D2-000000000000008F-MatterNodeDevice-2-PM10Sensor-1069-0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[air_purifier][sensor.air_purifier_pm10-state]
@@ -530,7 +530,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Air Purifier PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.air_purifier_pm10',
@@ -574,7 +574,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00000000000004D2-000000000000008F-MatterNodeDevice-2-PM25Sensor-1066-0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[air_purifier][sensor.air_purifier_pm2_5-state]
@@ -583,7 +583,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Air Purifier PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.air_purifier_pm2_5',
@@ -1017,7 +1017,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00000000000004D2-0000000000000001-MatterNodeDevice-1-PM1Sensor-1068-0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[air_quality_sensor][sensor.lightfi_aq1_air_quality_sensor_pm1-state]
@@ -1026,7 +1026,7 @@
      'device_class': 'pm1',
      'friendly_name': 'lightfi-aq1-air-quality-sensor PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.lightfi_aq1_air_quality_sensor_pm1',
@@ -1070,7 +1070,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00000000000004D2-0000000000000001-MatterNodeDevice-1-PM10Sensor-1069-0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[air_quality_sensor][sensor.lightfi_aq1_air_quality_sensor_pm10-state]
@@ -1079,7 +1079,7 @@
      'device_class': 'pm10',
      'friendly_name': 'lightfi-aq1-air-quality-sensor PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.lightfi_aq1_air_quality_sensor_pm10',
@@ -1123,7 +1123,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '00000000000004D2-0000000000000001-MatterNodeDevice-1-PM25Sensor-1066-0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensors[air_quality_sensor][sensor.lightfi_aq1_air_quality_sensor_pm2_5-state]
@@ -1132,7 +1132,7 @@
      'device_class': 'pm25',
      'friendly_name': 'lightfi-aq1-air-quality-sensor PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.lightfi_aq1_air_quality_sensor_pm2_5',
@@ -26,6 +26,7 @@ from homeassistant.const import (
    ATTR_ENTITY_ID,
    ATTR_MODE,
    ATTR_UNIT_OF_MEASUREMENT,
+    UnitOfElectricPotential,
    UnitOfTemperature,
 )
 from homeassistant.core import HomeAssistant, State
@@ -253,6 +254,62 @@ async def test_native_value_validation(
    mqtt_mock.async_publish.reset_mock()


+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        {
+            mqtt.DOMAIN: {
+                number.DOMAIN: {
+                    "name": "test",
+                    "command_topic": "test-topic-cmd",
+                    "state_topic": "test-topic",
+                    "unit_of_measurement": "\u00b5V",
+                }
+            }
+        }
+    ],
+)
+async def test_equivalent_unit_of_measurement(
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test device_class with equivalent unit of measurement."""
+    assert await mqtt_mock_entry()
+    async_fire_mqtt_message(hass, "test-topic", "100")
+    await hass.async_block_till_done()
+    state = hass.states.get("number.test")
+    assert state is not None
+    assert state.state == "100"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+    caplog.clear()
+
+    discovery_payload = {
+        "name": "bla",
+        "command_topic": "test-topic2-cmd",
+        "state_topic": "test-topic2",
+        "unit_of_measurement": "\u00b5V",
+    }
+    # Now discover an invalid sensor
+    async_fire_mqtt_message(
+        hass, "homeassistant/number/bla/config", json.dumps(discovery_payload)
+    )
+    await hass.async_block_till_done()
+    async_fire_mqtt_message(hass, "test-topic2", "21")
+    await hass.async_block_till_done()
+    state = hass.states.get("number.bla")
+    assert state is not None
+    assert state.state == "21"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+
@pytest.mark.parametrize(
    "hass_config",
    [
@@ -15,9 +15,11 @@ import pytest
 from homeassistant.components import mqtt, sensor
 from homeassistant.components.mqtt.sensor import MQTT_SENSOR_ATTRIBUTES_BLOCKED
 from homeassistant.const import (
+    ATTR_UNIT_OF_MEASUREMENT,
    EVENT_STATE_CHANGED,
    STATE_UNAVAILABLE,
    STATE_UNKNOWN,
+    UnitOfElectricPotential,
    UnitOfTemperature,
 )
 from homeassistant.core import Event, HomeAssistant, State, callback
@@ -936,6 +938,116 @@ async def test_invalid_unit_of_measurement(
    assert len(events) == 1


+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        {
+            mqtt.DOMAIN: {
+                sensor.DOMAIN: {
+                    "name": "test",
+                    "state_topic": "test-topic",
+                    "device_class": "voltage",
+                    "unit_of_measurement": "\u00b5V",
+                }
+            }
+        }
+    ],
+)
+async def test_device_class_with_equivalent_unit_of_measurement_received(
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test device_class with equivalent unit of measurement."""
+    assert await mqtt_mock_entry()
+    async_fire_mqtt_message(hass, "test-topic", "100")
+    await hass.async_block_till_done()
+    state = hass.states.get("sensor.test")
+    assert state is not None
+    assert state.state == "100"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+    caplog.clear()
+
+    discovery_payload = {
+        "name": "bla",
+        "state_topic": "test-topic2",
+        "device_class": "voltage",
+        "unit_of_measurement": "\u00b5V",
+    }
+    # Now discover an invalid sensor
+    async_fire_mqtt_message(
+        hass, "homeassistant/sensor/bla/config", json.dumps(discovery_payload)
+    )
+    await hass.async_block_till_done()
+    async_fire_mqtt_message(hass, "test-topic2", "21")
+    await hass.async_block_till_done()
+    state = hass.states.get("sensor.bla")
+    assert state is not None
+    assert state.state == "21"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+
+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        {
+            mqtt.DOMAIN: {
+                sensor.DOMAIN: {
+                    "name": "test",
+                    "state_topic": "test-topic",
+                    "unit_of_measurement": "\u00b5V",
+                }
+            }
+        }
+    ],
+)
+async def test_equivalent_unit_of_measurement_received_without_device_class(
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test device_class with equivalent unit of measurement."""
+    assert await mqtt_mock_entry()
+    async_fire_mqtt_message(hass, "test-topic", "100")
+    await hass.async_block_till_done()
+    state = hass.states.get("sensor.test")
+    assert state is not None
+    assert state.state == "100"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+    caplog.clear()
+
+    discovery_payload = {
+        "name": "bla",
+        "state_topic": "test-topic2",
+        "unit_of_measurement": "\u00b5V",
+    }
+    # Now discover an invalid sensor
+    async_fire_mqtt_message(
+        hass, "homeassistant/sensor/bla/config", json.dumps(discovery_payload)
+    )
+    await hass.async_block_till_done()
+    async_fire_mqtt_message(hass, "test-topic2", "21")
+    await hass.async_block_till_done()
+    state = hass.states.get("sensor.bla")
+    assert state is not None
+    assert state.state == "21"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+
@pytest.mark.parametrize(
    "hass_config",
    [
@@ -981,7 +981,7 @@
    'supported_features': 0,
    'translation_key': 'pmsx003_pm1',
    'unique_id': 'aa:bb:cc:dd:ee:ff-pms_p0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_pmsx003_pm1-state]
@@ -990,7 +990,7 @@
      'device_class': 'pm1',
      'friendly_name': 'Nettigo Air Monitor PMSx003 PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_pmsx003_pm1',
@@ -1037,7 +1037,7 @@
    'supported_features': 0,
    'translation_key': 'pmsx003_pm10',
    'unique_id': 'aa:bb:cc:dd:ee:ff-pms_p1',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_pmsx003_pm10-state]
@@ -1046,7 +1046,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Nettigo Air Monitor PMSx003 PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_pmsx003_pm10',
@@ -1093,7 +1093,7 @@
    'supported_features': 0,
    'translation_key': 'pmsx003_pm25',
    'unique_id': 'aa:bb:cc:dd:ee:ff-pms_p2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_pmsx003_pm2_5-state]
@@ -1102,7 +1102,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Nettigo Air Monitor PMSx003 PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_pmsx003_pm2_5',
@@ -1261,7 +1261,7 @@
    'supported_features': 0,
    'translation_key': 'sds011_pm10',
    'unique_id': 'aa:bb:cc:dd:ee:ff-sds011_p1',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_sds011_pm10-state]
@@ -1270,7 +1270,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Nettigo Air Monitor SDS011 PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_sds011_pm10',
@@ -1317,7 +1317,7 @@
    'supported_features': 0,
    'translation_key': 'sds011_pm25',
    'unique_id': 'aa:bb:cc:dd:ee:ff-sds011_p2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_sds011_pm2_5-state]
@@ -1326,7 +1326,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Nettigo Air Monitor SDS011 PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_sds011_pm2_5',
@@ -1653,7 +1653,7 @@
    'supported_features': 0,
    'translation_key': 'sps30_pm1',
    'unique_id': 'aa:bb:cc:dd:ee:ff-sps30_p0',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_sps30_pm1-state]
@@ -1662,7 +1662,7 @@
      'device_class': 'pm1',
      'friendly_name': 'Nettigo Air Monitor SPS30 PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_sps30_pm1',
@@ -1709,7 +1709,7 @@
    'supported_features': 0,
    'translation_key': 'sps30_pm10',
    'unique_id': 'aa:bb:cc:dd:ee:ff-sps30_p1',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_sps30_pm10-state]
@@ -1718,7 +1718,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Nettigo Air Monitor SPS30 PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_sps30_pm10',
@@ -1765,7 +1765,7 @@
    'supported_features': 0,
    'translation_key': 'sps30_pm25',
    'unique_id': 'aa:bb:cc:dd:ee:ff-sps30_p2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_sps30_pm2_5-state]
@@ -1774,7 +1774,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Nettigo Air Monitor SPS30 PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_sps30_pm2_5',
@@ -1821,7 +1821,7 @@
    'supported_features': 0,
    'translation_key': 'sps30_pm4',
    'unique_id': 'aa:bb:cc:dd:ee:ff-sps30_p4',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor[sensor.nettigo_air_monitor_sps30_pm4-state]
@@ -1829,7 +1829,7 @@
    'attributes': ReadOnlyDict({
      'friendly_name': 'Nettigo Air Monitor SPS30 PM4',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.nettigo_air_monitor_sps30_pm4',
@@ -7,6 +7,7 @@ from unittest.mock import MagicMock, patch
 import pytest

 from homeassistant.components.number import (
+    AMBIGUOUS_UNITS,
    ATTR_MAX,
    ATTR_MIN,
    ATTR_MODE,
@@ -48,6 +49,7 @@ from . import common

 from tests.common import (
    MockConfigEntry,
+    MockEntity,
    MockModule,
    MockPlatform,
    async_mock_restore_state_shutdown_restart,
@@ -61,6 +63,25 @@ from tests.common import (
 TEST_DOMAIN = "test"


+class MockNumber(MockEntity, NumberEntity):
+    """Mock NumberEntity class to test unit of measurement."""
+
+    @property
+    def device_class(self):
+        """Return the class of this sensor."""
+        return self._handle("device_class")
+
+    @property
+    def native_unit_of_measurement(self):
+        """Return the native unit_of_measurement of this sensor."""
+        return self._handle("native_unit_of_measurement")
+
+    @property
+    def native_value(self):
+        """Return the native value of this sensor."""
+        return self._handle("native_value")
+
+
 class MockDefaultNumberEntity(NumberEntity):
    """Mock NumberEntity device to use in tests.

@@ -900,6 +921,33 @@ async def test_translated_unit_with_native_unit_raises(
        assert entity0.entity_id is None


+@pytest.mark.parametrize(
+    ("ambiguous_unit", "normalized_unit"),
+    [
+        (ambiguous_unit, normalized_unit)
+        for ambiguous_unit, normalized_unit in AMBIGUOUS_UNITS.items()
+    ],
+)
+async def test_ambiguous_unit_of_measurement_compat(
+    hass: HomeAssistant, ambiguous_unit: str, normalized_unit: str
+) -> None:
+    """Test ambiguous native_unit_of_measurement values are corrected."""
+    entity0 = MockNumber(
+        name="Test",
+        native_value="0.0",
+        native_unit_of_measurement=ambiguous_unit,
+    )
+    setup_test_component_platform(hass, DOMAIN, [entity0])
+
+    assert await async_setup_component(hass, "number", {"number": {"platform": "test"}})
+    await hass.async_block_till_done()
+
+    # Check compatible unit is applied
+    state = hass.states.get(entity0.entity_id)
+    assert state.state == "0.0"
+    assert state.attributes[ATTR_UNIT_OF_MEASUREMENT] == normalized_unit
+
+
 def test_device_classes_aligned() -> None:
    """Make sure all sensor device classes are also available in NumberDeviceClass."""

@@ -140,7 +140,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '12.34-56.78-no2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor_states[air_pollution][sensor.openweathermap_nitrogen_dioxide-state]
@@ -150,7 +150,7 @@
      'device_class': 'nitrogen_dioxide',
      'friendly_name': 'openweathermap Nitrogen dioxide',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.openweathermap_nitrogen_dioxide',
@@ -194,7 +194,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '12.34-56.78-no',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor_states[air_pollution][sensor.openweathermap_nitrogen_monoxide-state]
@@ -204,7 +204,7 @@
      'device_class': 'nitrogen_monoxide',
      'friendly_name': 'openweathermap Nitrogen monoxide',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.openweathermap_nitrogen_monoxide',
@@ -248,7 +248,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '12.34-56.78-o3',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor_states[air_pollution][sensor.openweathermap_ozone-state]
@@ -258,7 +258,7 @@
      'device_class': 'ozone',
      'friendly_name': 'openweathermap Ozone',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.openweathermap_ozone',
@@ -302,7 +302,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '12.34-56.78-pm10',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor_states[air_pollution][sensor.openweathermap_pm10-state]
@@ -312,7 +312,7 @@
      'device_class': 'pm10',
      'friendly_name': 'openweathermap PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.openweathermap_pm10',
@@ -356,7 +356,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '12.34-56.78-pm2_5',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor_states[air_pollution][sensor.openweathermap_pm2_5-state]
@@ -366,7 +366,7 @@
      'device_class': 'pm25',
      'friendly_name': 'openweathermap PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.openweathermap_pm2_5',
@@ -410,7 +410,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': '12.34-56.78-so2',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_sensor_states[air_pollution][sensor.openweathermap_sulphur_dioxide-state]
@@ -420,7 +420,7 @@
      'device_class': 'sulphur_dioxide',
      'friendly_name': 'openweathermap Sulphur dioxide',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.openweathermap_sulphur_dioxide',
@@ -29,15 +29,15 @@ UNITS_OF_MEASUREMENT = {
    SensorDeviceClass.HUMIDITY: PERCENTAGE,  # % of humidity in the air
    SensorDeviceClass.ILLUMINANCE: LIGHT_LUX,  # current light level lx
    SensorDeviceClass.MOISTURE: PERCENTAGE,  # % of water in a substance
-    SensorDeviceClass.NITROGEN_DIOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of nitrogen dioxide
-    SensorDeviceClass.NITROGEN_MONOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of nitrogen monoxide
-    SensorDeviceClass.NITROUS_OXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of nitrogen oxide
-    SensorDeviceClass.OZONE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of ozone
-    SensorDeviceClass.PM1: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of PM1
-    SensorDeviceClass.PM10: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of PM10
-    SensorDeviceClass.PM25: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of PM2.5
+    SensorDeviceClass.NITROGEN_DIOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of nitrogen dioxide
+    SensorDeviceClass.NITROGEN_MONOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of nitrogen monoxide
+    SensorDeviceClass.NITROUS_OXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of nitrogen oxide
+    SensorDeviceClass.OZONE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of ozone
+    SensorDeviceClass.PM1: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of PM1
+    SensorDeviceClass.PM10: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of PM10
+    SensorDeviceClass.PM25: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of PM2.5
    SensorDeviceClass.SIGNAL_STRENGTH: SIGNAL_STRENGTH_DECIBELS,  # signal strength (dB/dBm)
-    SensorDeviceClass.SULPHUR_DIOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of sulphur dioxide
+    SensorDeviceClass.SULPHUR_DIOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of sulphur dioxide
    SensorDeviceClass.TEMPERATURE: "C",  # temperature (C/F)
    SensorDeviceClass.PRESSURE: UnitOfPressure.HPA,  # pressure (hPa/mbar)
    SensorDeviceClass.POWER: "kW",  # power (W/kW)
@@ -47,7 +47,7 @@ UNITS_OF_MEASUREMENT = {
    SensorDeviceClass.POWER_FACTOR: PERCENTAGE,  # power factor (no unit, min: -1.0, max: 1.0)
    SensorDeviceClass.REACTIVE_ENERGY: UnitOfReactiveEnergy.VOLT_AMPERE_REACTIVE_HOUR,  # reactive energy (varh)
    SensorDeviceClass.REACTIVE_POWER: UnitOfReactivePower.VOLT_AMPERE_REACTIVE,  # reactive power (var)
-    SensorDeviceClass.VOLATILE_ORGANIC_COMPOUNDS: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of vocs
+    SensorDeviceClass.VOLATILE_ORGANIC_COMPOUNDS: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # μg/m³ of vocs
    SensorDeviceClass.VOLTAGE: "V",  # voltage (V)
    SensorDeviceClass.GAS: UnitOfVolume.CUBIC_METERS,  # gas (m³)
 }
@@ -159,12 +159,39 @@ async def test_temperature_conversion_wrong_device_class(
    assert await async_setup_component(hass, "sensor", {"sensor": {"platform": "test"}})
    await hass.async_block_till_done()

-    # Check temperature is not converted
+    # Check compatible unit is applied
    state = hass.states.get(entity0.entity_id)
    assert state.state == "0.0"
    assert state.attributes[ATTR_UNIT_OF_MEASUREMENT] == UnitOfTemperature.FAHRENHEIT


+@pytest.mark.parametrize(
+    ("ambiguous_unit", "normalized_unit"),
+    [
+        (ambiguous_unit, normalized_unit)
+        for ambiguous_unit, normalized_unit in sensor.AMBIGUOUS_UNITS.items()
+    ],
+)
+async def test_ambiguous_unit_of_measurement_compat(
+    hass: HomeAssistant, ambiguous_unit: str, normalized_unit: str
+) -> None:
+    """Test ambiguous native_unit_of_measurement values are corrected."""
+    entity0 = MockSensor(
+        name="Test",
+        native_value="0.0",
+        native_unit_of_measurement=ambiguous_unit,
+    )
+    setup_test_component_platform(hass, sensor.DOMAIN, [entity0])
+
+    assert await async_setup_component(hass, "sensor", {"sensor": {"platform": "test"}})
+    await hass.async_block_till_done()
+
+    # Check temperature is not converted
+    state = hass.states.get(entity0.entity_id)
+    assert state.state == "0.0"
+    assert state.attributes[ATTR_UNIT_OF_MEASUREMENT] == normalized_unit
+
+
@pytest.mark.parametrize("state_class", ["measurement", "total_increasing"])
 async def test_deprecated_last_reset(
    hass: HomeAssistant,
@@ -3755,6 +3755,44 @@ async def test_compile_hourly_statistics_convert_units_1(
            30,
        ),
        (None, "m3", "m³", None, "volume", 13.050847, 13.333333, -10, 30),
+        (None, "\u00b5V", "\u03bcV", None, "voltage", 13.050847, 13.333333, -10, 30),
+        (None, "\u00b5Sv/h", "\u03bcSv/h", None, None, 13.050847, 13.333333, -10, 30),
+        (
+            None,
+            "\u00b5S/cm",
+            "\u03bcS/cm",
+            None,
+            "conductivity",
+            13.050847,
+            13.333333,
+            -10,
+            30,
+        ),
+        (None, "\u00b5g/ft³", "\u03bcg/ft³", None, None, 13.050847, 13.333333, -10, 30),
+        (
+            None,
+            "\u00b5g/m³",
+            "\u03bcg/m³",
+            None,
+            "concentration",
+            13.050847,
+            13.333333,
+            -10,
+            30,
+        ),
+        (
+            None,
+            "\u00b5mol/s⋅m²",
+            "\u03bcmol/s⋅m²",
+            None,
+            None,
+            13.050847,
+            13.333333,
+            -10,
+            30,
+        ),
+        (None, "\u00b5g", "\u03bcg", None, "mass", 13.050847, 13.333333, -10, 30),
+        (None, "\u00b5s", "\u03bcs", None, "duration", 13.050847, 13.333333, -10, 30),
    ],
 )
 async def test_compile_hourly_statistics_equivalent_units_1(
@@ -3884,6 +3922,17 @@ async def test_compile_hourly_statistics_equivalent_units_1(
        (None, "ft3", "ft³", None, 13.333333, -10, 30),
        (None, "ft³/m", "ft³/min", None, 13.333333, -10, 30),
        (None, "m3", "m³", None, 13.333333, -10, 30),
+        (None, "\u00b5V", "\u03bcV", None, 13.333333, -10, 30),
+        (SensorDeviceClass.VOLTAGE, "\u00b5V", "\u03bcV", None, 13.333333, -10, 30),
+        (None, "\u00b5Sv/h", "\u03bcSv/h", None, 13.333333, -10, 30),
+        (None, "\u00b5S/cm", "\u03bcS/cm", None, 13.333333, -10, 30),
+        (None, "\u00b5g/ft³", "\u03bcg/ft³", None, 13.333333, -10, 30),
+        (None, "\u00b5g/m³", "\u03bcg/m³", None, 13.333333, -10, 30),
+        (None, "\u00b5mol/s⋅m²", "\u03bcmol/s⋅m²", None, 13.333333, -10, 30),
+        (None, "\u00b5g", "\u03bcg", None, 13.333333, -10, 30),
+        (SensorDeviceClass.WEIGHT, "\u00b5g", "\u03bcg", None, 13.333333, -10, 30),
+        (None, "\u00b5s", "\u03bcs", None, 13.333333, -10, 30),
+        (SensorDeviceClass.DURATION, "\u00b5s", "\u03bcs", None, 13.333333, -10, 30),
    ],
 )
 async def test_compile_hourly_statistics_equivalent_units_2(
@@ -5705,6 +5754,14 @@ async def test_validate_statistics_unit_change_no_conversion(
        (NONE_SENSOR_ATTRIBUTES, "m3", "m³"),
        (NONE_SENSOR_ATTRIBUTES, "rpm", "RPM"),
        (NONE_SENSOR_ATTRIBUTES, "RPM", "rpm"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5V", "\u03bcV"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5Sv/h", "\u03bcSv/h"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5S/cm", "\u03bcS/cm"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5g/ft³", "\u03bcg/ft³"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5g/m³", "\u03bcg/m³"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5mol/s⋅m²", "\u03bcmol/s⋅m²"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5g", "\u03bcg"),
+        (NONE_SENSOR_ATTRIBUTES, "\u00b5s", "\u03bcs"),
    ],
 )
 async def test_validate_statistics_unit_change_equivalent_units(
@@ -5768,6 +5825,15 @@ async def test_validate_statistics_unit_change_equivalent_units(
    ("attributes", "unit1", "unit2", "supported_unit"),
    [
        (NONE_SENSOR_ATTRIBUTES, "m³", "m3", "CCF, L, fl. oz., ft³, gal, mL, m³"),
+        (NONE_SENSOR_ATTRIBUTES, "\u03bcV", "\u00b5V", "MV, V, kV, mV, \u03bcV"),
+        (NONE_SENSOR_ATTRIBUTES, "\u03bcS/cm", "\u00b5S/cm", "S/cm, mS/cm, \u03bcS/cm"),
+        (
+            NONE_SENSOR_ATTRIBUTES,
+            "\u03bcg",
+            "\u00b5g",
+            "g, kg, lb, mg, oz, st, \u03bcg",
+        ),
+        (NONE_SENSOR_ATTRIBUTES, "\u03bcs", "\u00b5s", "d, h, min, ms, s, w, \u03bcs"),
    ],
 )
 async def test_validate_statistics_unit_change_equivalent_units_2(
@@ -951,7 +951,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'a3a970ea-e09c-9c04-161b-94c934e21666_main_veryFineDustSensor_veryFineDustLevel_veryFineDustLevel',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[da_ac_airsensor_01001][sensor.eeomoniteo_peulreoseu_pm1-state]
@@ -960,7 +960,7 @@
      'device_class': 'pm1',
      'friendly_name': '에어모니터 플러스 PM1',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.eeomoniteo_peulreoseu_pm1',
@@ -1004,7 +1004,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'a3a970ea-e09c-9c04-161b-94c934e21666_main_dustSensor_dustLevel_dustLevel',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[da_ac_airsensor_01001][sensor.eeomoniteo_peulreoseu_pm10-state]
@@ -1013,7 +1013,7 @@
      'device_class': 'pm10',
      'friendly_name': '에어모니터 플러스 PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.eeomoniteo_peulreoseu_pm10',
@@ -1057,7 +1057,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'a3a970ea-e09c-9c04-161b-94c934e21666_main_dustSensor_fineDustLevel_fineDustLevel',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[da_ac_airsensor_01001][sensor.eeomoniteo_peulreoseu_pm2_5-state]
@@ -1066,7 +1066,7 @@
      'device_class': 'pm25',
      'friendly_name': '에어모니터 플러스 PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.eeomoniteo_peulreoseu_pm2_5',
@@ -2820,7 +2820,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'F8042E25-0E53-0000-0000-000000000000_main_dustSensor_dustLevel_dustLevel',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[da_ac_rac_100001][sensor.corridor_a_c_pm10-state]
@@ -2829,7 +2829,7 @@
      'device_class': 'pm10',
      'friendly_name': 'Corridor A/C PM10',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.corridor_a_c_pm10',
@@ -2873,7 +2873,7 @@
    'supported_features': 0,
    'translation_key': None,
    'unique_id': 'F8042E25-0E53-0000-0000-000000000000_main_dustSensor_fineDustLevel_fineDustLevel',
-    'unit_of_measurement': 'µg/m³',
+    'unit_of_measurement': 'μg/m³',
  })
 # ---
 # name: test_all_entities[da_ac_rac_100001][sensor.corridor_a_c_pm2_5-state]
@@ -2882,7 +2882,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Corridor A/C PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.corridor_a_c_pm2_5',
@@ -361,7 +361,7 @@
      'supported_features': 0,
      'translation_key': None,
      'unique_id': '400s-purifier-pm25',
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
  ])
 # ---
@@ -399,7 +399,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Air Purifier 400s PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.air_purifier_400s_pm2_5',
@@ -547,7 +547,7 @@
      'supported_features': 0,
      'translation_key': None,
      'unique_id': '600s-purifier-pm25',
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
  ])
 # ---
@@ -585,7 +585,7 @@
      'device_class': 'pm25',
      'friendly_name': 'Air Purifier 600s PM2.5',
      'state_class': <SensorStateClass.MEASUREMENT: 'measurement'>,
-      'unit_of_measurement': 'µg/m³',
+      'unit_of_measurement': 'μg/m³',
    }),
    'context': <ANY>,
    'entity_id': 'sensor.air_purifier_600s_pm2_5',
@@ -262,7 +262,7 @@ async def test_xiaomi_hhccjcy01(hass: HomeAssistant) -> None:
    cond_sensor_attribtes = cond_sensor.attributes
    assert cond_sensor.state == "599"
    assert cond_sensor_attribtes[ATTR_FRIENDLY_NAME] == "Plant Sensor 3E7A Conductivity"
-    assert cond_sensor_attribtes[ATTR_UNIT_OF_MEASUREMENT] == "µS/cm"
+    assert cond_sensor_attribtes[ATTR_UNIT_OF_MEASUREMENT] == "μS/cm"
    assert cond_sensor_attribtes[ATTR_STATE_CLASS] == "measurement"

    moist_sensor = hass.states.get("sensor.plant_sensor_3e7a_moisture")
@@ -351,7 +351,7 @@ async def test_xiaomi_hhccjcy01_not_connectable(hass: HomeAssistant) -> None:
    cond_sensor_attribtes = cond_sensor.attributes
    assert cond_sensor.state == "599"
    assert cond_sensor_attribtes[ATTR_FRIENDLY_NAME] == "Plant Sensor 3E7A Conductivity"
-    assert cond_sensor_attribtes[ATTR_UNIT_OF_MEASUREMENT] == "µS/cm"
+    assert cond_sensor_attribtes[ATTR_UNIT_OF_MEASUREMENT] == "μS/cm"
    assert cond_sensor_attribtes[ATTR_STATE_CLASS] == "measurement"

    moist_sensor = hass.states.get("sensor.plant_sensor_3e7a_moisture")
@@ -438,7 +438,7 @@ async def test_xiaomi_hhccjcy01_only_some_sources_connectable(
    cond_sensor_attribtes = cond_sensor.attributes
    assert cond_sensor.state == "599"
    assert cond_sensor_attribtes[ATTR_FRIENDLY_NAME] == "Plant Sensor 3E7A Conductivity"
-    assert cond_sensor_attribtes[ATTR_UNIT_OF_MEASUREMENT] == "µS/cm"
+    assert cond_sensor_attribtes[ATTR_UNIT_OF_MEASUREMENT] == "μS/cm"
    assert cond_sensor_attribtes[ATTR_STATE_CLASS] == "measurement"

    moist_sensor = hass.states.get("sensor.plant_sensor_3e7a_moisture")
@@ -653,7 +653,7 @@ async def test_hhccjcy10_uuid(hass: HomeAssistant) -> None:
    cond_sensor_attr = cond_sensor.attributes
    assert cond_sensor.state == "91"
    assert cond_sensor_attr[ATTR_FRIENDLY_NAME] == "Plant Sensor 5BFC Conductivity"
-    assert cond_sensor_attr[ATTR_UNIT_OF_MEASUREMENT] == "µS/cm"
+    assert cond_sensor_attr[ATTR_UNIT_OF_MEASUREMENT] == "μS/cm"
    assert cond_sensor_attr[ATTR_STATE_CLASS] == "measurement"

    moist_sensor = hass.states.get("sensor.plant_sensor_5bfc_moisture")
@@ -138,3 +138,24 @@ def decorator_checker_fixture(hass_decorator, linter) -> BaseChecker:
    type_hint_checker = hass_decorator.HassDecoratorChecker(linter)
    type_hint_checker.module = "homeassistant.components.pylint_test"
    return type_hint_checker
+
+
+@pytest.fixture(name="hass_enforce_greek_micro_char", scope="package")
+def hass_enforce_greek_micro_checker_fixture() -> ModuleType:
+    """Fixture to the content for the hass_enforce_greek_micro_char check."""
+    return _load_plugin_from_file(
+        "hass_enforce_greek_micro_char",
+        "pylint/plugins/hass_enforce_greek_micro_char.py",
+    )
+
+
+@pytest.fixture(name="enforce_greek_micro_char_checker")
+def enforce_greek_micro_char_checker_fixture(
+    hass_enforce_greek_micro_char, linter
+) -> BaseChecker:
+    """Fixture to provide a hass_enforce_greek_micro_char checker."""
+    enforce_greek_micro_char_checker = (
+        hass_enforce_greek_micro_char.HassEnforceGreekMicroCharChecker(linter)
+    )
+    enforce_greek_micro_char_checker.module = "homeassistant.components.pylint_test"
+    return enforce_greek_micro_char_checker
@@ -0,0 +1,149 @@
+"""Tests for pylint hass_enforce_greek_micro_char plugin."""
+
+from __future__ import annotations
+
+import astroid
+from pylint.checkers import BaseChecker
+from pylint.testutils.unittest_linter import UnittestLinter
+from pylint.utils.ast_walker import ASTWalker
+import pytest
+
+from . import assert_no_messages
+
+
+@pytest.mark.parametrize(
+    "code",
+    [
+        pytest.param(
+            """
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "μg/m³"  # "μ" == "\u03bc"
+        """,
+            id="good_const_with_annotation",
+        ),
+        pytest.param(
+            """
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "\u03bcg/m³"  # "μ" == "\u03bc"
+        """,
+            id="good_unicode_const_with_annotation",
+        ),
+        pytest.param(
+            """
+        CONCENTRATION_MICROGRAMS_PER_CUBIC_METER = "μg/m³"  # "μ" == "\u03bc"
+        """,
+            id="good_const_without_annotation",
+        ),
+        pytest.param(
+            """
+            class UnitOfElectricPotential(StrEnum):
+                \"\"\"Electric potential units.\"\"\"
+
+                MICROVOLT = "μV"  # "μ" == "\u03bc"
+                MILLIVOLT = "mV"
+                VOLT = "V"
+                KILOVOLT = "kV"
+                MEGAVOLT = "MV"
+        """,
+            id="good_str_enum",
+        ),
+        pytest.param(
+            """
+            SENSOR_DESCRIPTION = {
+                "radiation_rate": AranetSensorEntityDescription(
+                    key="radiation_rate",
+                    translation_key="radiation_rate",
+                    name="Radiation Dose Rate",
+                    native_unit_of_measurement="μSv/h",  # "μ" == "\u03bc"
+                    state_class=SensorStateClass.MEASUREMENT,
+                    suggested_display_precision=2,
+                    scale=0.001,
+                ),
+            }
+            OTHER_DICT = {
+                "value_with_bad_mu_should_pass": "µ"
+            }
+        """,
+            id="good_sensor_description",
+        ),
+    ],
+)
+def test_enforce_greek_micro_char(
+    linter: UnittestLinter,
+    enforce_greek_micro_char_checker: BaseChecker,
+    code: str,
+) -> None:
+    """Good test cases."""
+    root_node = astroid.parse(code, "homeassistant.components.pylint_test")
+    walker = ASTWalker(linter)
+    walker.add_checker(enforce_greek_micro_char_checker)
+
+    with assert_no_messages(linter):
+        walker.walk(root_node)
+
+
+@pytest.mark.parametrize(
+    "code",
+    [
+        pytest.param(
+            """
+            CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "µg/m³"  # "μ" != "\u03bc"
+        """,
+            id="bad_const_with_annotation",
+        ),
+        pytest.param(
+            """
+            CONCENTRATION_MICROGRAMS_PER_CUBIC_METER: Final = "\u00b5g/m³"  # "μ" != "\u03bc"
+        """,
+            id="bad_unicode_const_with_annotation",
+        ),
+        pytest.param(
+            """
+            CONCENTRATION_MICROGRAMS_PER_CUBIC_METER = "µg/m³"  # "μ" != "\u03bc"
+        """,
+            id="bad_const_without_annotation",
+        ),
+        pytest.param(
+            """
+            class UnitOfElectricPotential(StrEnum):
+                \"\"\"Electric potential units.\"\"\"
+
+                MICROVOLT = "µV"  # "μ" != "\u03bc"
+                MILLIVOLT = "mV"
+                VOLT = "V"
+                KILOVOLT = "kV"
+                MEGAVOLT = "MV"
+        """,
+            id="bad_str_enum",
+        ),
+        pytest.param(
+            """
+            SENSOR_DESCRIPTION = {
+                "radiation_rate": AranetSensorEntityDescription(
+                    key="radiation_rate",
+                    translation_key="radiation_rate",
+                    name="Radiation Dose Rate",
+                    native_unit_of_measurement="µSv/h",  # "μ" != "\u03bc"
+                    state_class=SensorStateClass.MEASUREMENT,
+                    suggested_display_precision=2,
+                    scale=0.001,
+                ),
+            }
+        """,
+            id="bad_sensor_description",
+        ),
+    ],
+)
+def test_enforce_greek_micro_char_assign_bad(
+    linter: UnittestLinter,
+    enforce_greek_micro_char_checker: BaseChecker,
+    code: str,
+) -> None:
+    """Bad assignment test cases."""
+    root_node = astroid.parse(code, "homeassistant.components.pylint_test")
+    walker = ASTWalker(linter)
+    walker.add_checker(enforce_greek_micro_char_checker)
+
+    walker.walk(root_node)
+    messages = linter.release_messages()
+    assert len(messages) == 1
+    message = next(iter(messages))
+    assert message.msg_id == "hass-enforce-greek-micro-char"
@@ -118,7 +118,7 @@ def test_deprecated_unit_of_conductivity_alias() -> None:
    """Test UnitOfConductivity deprecation."""

    # Test the deprecated members are aliases
-    assert set(const.UnitOfConductivity) == {"S/cm", "µS/cm", "mS/cm"}
+    assert set(const.UnitOfConductivity) == {"S/cm", "μS/cm", "mS/cm"}


 def test_deprecated_unit_of_conductivity_members(
Author	SHA1	Message	Date
jbouwh	c8aafc6702	Fix mqt sensor unit validation, fix openweather snapshot	2025-06-01 19:55:41 +00:00
Jan Bouwhuis	a53d010dc2	Merge branch 'dev' into fix-microsign-alt1	2025-06-01 20:14:12 +02:00
jbouwh	22b5b67a25	Fix recorder tests	2025-06-01 17:33:52 +00:00
jbouwh	e3fe99e130	Add unit compatibility to number entity platform	2025-05-28 13:36:46 +00:00
Jan Bouwhuis	6f718c2de0	Update homeassistant/components/sensor/__init__.py Co-authored-by: Erik Montnemery <erik@montnemery.com>	2025-05-28 13:36:46 +00:00
jbouwh	012cea9f37	Do not cache unit of measurement	2025-05-28 13:36:46 +00:00
jbouwh	335621a7a9	Allow sensor ambiguous native_unit_of_measurement for compatibility	2025-05-28 13:36:46 +00:00
jbouwh	1c4c52e46a	Fix recorder tests	2025-05-28 13:36:46 +00:00
jbouwh	dca353c306	Add tests	2025-05-28 13:36:46 +00:00
jbouwh	a9e39c9354	typo	2025-05-28 13:36:46 +00:00
jbouwh	a49b584955	Update link	2025-05-28 13:36:46 +00:00
Jan Bouwhuis	3a116ea4ad	Update pylint/plugins/hass_enforce_greek_micro_char.py Co-authored-by: Erik Montnemery <erik@montnemery.com>	2025-05-28 13:36:46 +00:00
jbouwh	4e02f5406e	Add sensor recorder test cases	2025-05-28 13:36:46 +00:00
jbouwh	e3ae289ee4	Include MQTT number and assert on sensor and number unit	2025-05-28 13:36:46 +00:00
jbouwh	f0906ac5c0	Allow equivalent sensor units for MQTT sensor	2025-05-28 13:35:40 +00:00
jbouwh	e1739ccd87	Manage equivalent sensor units for recorder	2025-05-28 13:35:40 +00:00
jbouwh	83106c9e9d	Stale doc strings	2025-05-28 13:35:40 +00:00
jbouwh	55da0d1d4f	Fix prometheus	2025-05-28 13:35:40 +00:00
jbouwh	6fa4190441	Add linter to check correct microchar use	2025-05-28 13:35:40 +00:00
jbouwh	9202b4d746	consequent comments	2025-05-28 13:35:40 +00:00
jbouwh	9f00dfdbbf	Use remark # μ == '\u03bc'	2025-05-28 13:35:40 +00:00
jbouwh	d7086d5c7c	Fix comment	2025-05-28 13:35:40 +00:00
jbouwh	b3074d272a	Use b'\xce\xbc` for micro sign instead of b'\xc2\xb5'	2025-05-28 13:35:40 +00:00