docs: def low_limit(self) -> Optional[Union[int, float]]:
          """
          Low limit setting for a special sensor.
  
          For LS-10/LS-20 base units this is the alarm low limit.
          For LS-30 base units, this is either alarm OR control low limit,
          as indicated by special_status ControlAlarm bit flag.
          """
          return self._get_field_value(SpecialDevice.PROP_LOW_LIMIT)