... , panel meter 1.Measuring 28 items power meter 2.CE&ISO certification Kwh Meter 3.4- ... To measure: voltage, current, active power, reactive power, power factor, frequency, Kwh, 4 quadrant energy, etc. Total 28 electrical parameters;2) 3 lines 4 ... analog output 4-20mA for voltage, current, active power, reactive power, frequency, power factor;8) With RS485 communication function (Modbus RTU protocol ...