... & voltage meter 1) measure voltage/current/power factor/Kwh,etc 2) 4-20mA analog output 3) 2 alarm, RS485 Coulometer, ampere & ... voltage meterToky DW9 series Single Phase Power Meter with follow features:1) 3 lines 4 digit LED display, easy to read ... ;2) To measure voltage, current, power factor, active power, reactive power, apparent power, HZ, KWH;3) With up to 2 relay alarm output ...