... voltage, current, power factor, KWH, etc 3) 2 alarm, RS485 single phase Kwh meter / voltage meter / ampere meter DW8 series ampere meter ... meter, voltage meter 1) To measure true effective value (for AC signal); 2) To measure voltage, current, power factor, active power ... , reactive power, appearant power and Kwh;3) Two relay alarm output, alarm value set freely;4) Some model with ...