... voltage meter 2)Measure voltage, current, power factor, KWH, etc 3) 2 alarm, RS485 single phase Kwh meter / voltage meter / ampere ... meter DW8 series ampere meter, power meter, voltage meter 1) ... 2) To measure voltage, current, power factor, active power, reactive power, appearant power and Kwh;3) Two relay alarm output, alarm value set ...