◆Err-04: The clock battery voltage is low - the battery voltage is low, and the LCD has the battery display "" symbol. If the power is cut off, the time of the meter will be lost, and the meter needs to be replaced at this time.
◆Err-04: The clock battery voltage is low - the battery voltage is low, and the LCD has the battery display "" symbol. If the power is cut off, the time of the meter will be lost, and the meter needs to be replaced at this time.