... FS+1digit 2)AC/DC current or voltage 3)Modular output: Alarm, RS485 DP4-RMS Digital Ammeter/Voltmeter series are intelligent ... NO: 4-20mA, 0-10mA signal ouptut:RS485, RS232 communicationAlarm type : High and low limitsCommunication : RS485 or RS232 ,MODBUS- ... and experienced manufacturer, we can supply high quality and performance ammeter, voltmeter, current meter, voltage meter, power meter, pannel ...