... meter 2)Measure voltage, current, power factor, KWH, etc 3) 2 alarm, RS485 single phase Kwh meter / voltage meter / ampere meter DW8 ... , current, power factor, active power, reactive power, appearant power and Kwh;3) Two relay alarm output, alarm value set freely;4 ... ) Some model with 4-20mA analog current output;5) Some model with RS485 communication function.