'Return the state of the sensor.'

@property
def state(self):

    temp_sensors = ['volume_disk_temp_avg', 'volume_disk_temp_max', 'disk_temp']
    if (self.monitor_device is not None):
        if (self.var_id in temp_sensors):
            attr = getattr(self._api.storage, self.var_id)(self.monitor_device)
            if (self._api.temp_unit == TEMP_CELSIUS):
                return attr
            return round(((attr * 1.8) + 32.0), 1)
        return getattr(self._api.storage, self.var_id)(self.monitor_device)
