... . Measure and display three-phase voltage, three-phase current, active power, reactive power, power factor. frequency and four-phase ... ParameterAccuracyU,I 0.2 class, P,Q 0.5 class, Active electric energy 0.5 class, Reactive electric energy 2 classDisplayLED / LCD ... .4VA(each phase)Impedance<20kΩFrequency40-60Hz, accuracy 0.5%Electric energyActive and reactive electric energy measuring, accuracy class ...