... series 3 phase multi-function power meter:1) To measure: Voltage, Current, Active Power, Reactive Power, Power Factor, Frequency (Hz), Kwh ... output 4-20mA for voltage, current, active power, reactive power, frequency, power factor;8) With RS485 communication function (Modbus RTU ... unit and optional modules4. 10 years back-up of integrated energy data5. Large LCD, high brightness, auto-scrolling6. ...