... 2 alarm, RS485 Coulometer, ampere & voltage meterToky DW9 series Single Phase Power Meter with follow features:1 ... reactive power, apparent power, HZ, KWH;3) With up to 2 relay alarm output, alarm value ... set freely;4) For AC signal, display true effective value;5) With PT and CT value ... setting in software menu;6) Some model with 4-20mA analog current output;7) Some model with RS485 ...