... -20mA transmitter RS485 modbus protocol. DW series True Value Display (RMS) Power Meter,Energy Meter Features: 1) True effective measure: voltage, current, ... phase ,connection :any ,1 and 3 phase .3) Display: 3 lines 4 digit LED to show the above value. 3 phase 3 ... power etc., select freely.5) Transformed analog output 4-20mA for voltage, current, active power, reactive power, frequency power factor ...