... % F.S.Min unit: uA,mV. ZW series DC Power Meter/Coloumeter--2011 ZW8 Flat ... Features: 1) True effective measure: voltage, current, active power, reactive power, power factor, frequency, Kwh, ... relay output for voltage, current, power factor, active power, reactive power etc., select freely.5) ... analog output 4-20mA for voltage, current, active power, reactive power, frequency power factor etc., ...