... 3 phase multi-function power meter:1) To measure: Voltage, Current, Active Power, Reactive Power, Power Factor, Frequency (Hz), Kwh, 4 Quadrant ... 4-20mA for voltage, current, active power, reactive power, frequency, power factor;8) With RS485 communication function (Modbus RTU protocol ... back-up of integrated energy data5. Large LCD, high brightness, auto-scrolling6. High accuracy, V or I is 0.2%, kWh ...