Power Meter Measure:RMS,single or 3 phase,total 28 electrical parameters, 4 alarms ... 4-20mA transmitter RS485 modbus protocol. DW series True Value Display (RMS) Power Meter,Energy Meter ... TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer ...