... electronic coulometer,can measure voltage , current ,active power, reactive power ,apparent power ,PF,Kwh,Hz EU9 Series digital Kwh meter ... (I), Active power (P), Reactive power (Q), Appearant power(S), Power factor(PF) and Kwh, total 7 parameters.3) High & Low two ... alarm values setting4) Analog output: DC4~20mA5) Optional RS485, Modbus RTU6) Easy operation, data holding when power ...