fix unit of conductivity

Author: Ernst

custom_components/ble_monitor/const.py

@@ -830,7 +830,7 @@ class BLEMonitorBinarySensorEntityDescription(
         name="ble conductivity",
         unique_id="c_",
         icon="mdi:lightning-bolt-circle",
-        native_unit_of_measurement=UnitOfConductivity.MICROSIEMENS,
+        native_unit_of_measurement=UnitOfConductivity.MICROSIEMENS_PER_CM,
         device_class=None,
         suggested_display_precision=0,
         state_class=SensorStateClass.MEASUREMENT,