Power Meter Measure:RMS,single or 3 phase,total 28 electrical parameters, 4 alarms ... -20mA transmitter RS485 modbus protocol. DW series True Value Display (RMS) Power Meter,Energy Meter Features: 1) True effective measure: voltage, ... current, active power, reactive power, power factor, frequency, Kwh, etc. Total 28 electrical parameters; PT ...