... /LCD display 3. Current and Voltage Combined Meter. Name: Digital AC amp meter and Voltage Meter /dc ammeter meter voltmeter Model: YD4UI- ... , Voltage: AC100V,AC400V,OverloadingContinuance: 1.2 times, Instantaneous: current 10 times(5s), Voltage 2 times(10s)Frequency40-60Hz, class ... temperature:-20 to 75°COutputAnalog valueWhen DC4~20mA current output,Digital valueRS-485 interface, MODBUS-RTU protocol