... accuracy. 3. Good operation functions. Model: YD4E-9S4Function1). Measurement: U, I, P, Q, PF, F, EP all power parameter.2). Class: active power 0.5 class ... .5%Electric energyActive and reactive electric energy measuring, accuracy class 0.5%Power supplyWorking rangeAC,DC 80V~270VPower consumption≤5VAOutputDigital valueRS-485 Interface ...