... -RUT communication protocol. Description YD4Z-9SY multifunction electric power meter integrate the functions with programmable measurement ... .2%Frequency40~60Hz, accuracy 0.2HzFunctionActive power, Reactive power, Apparent power, Accuracy: 0.5% classElectric energyFour ... measurement, active poweraccuracy rate0.5 class%, reactive power accuracy rate0.5% classDisplayProgrammable, switching, circular two ...