... transmitter RS485 modbus protocol. DW series True Value Display (RMS) Power Meter,Energy Meter Features: 1) True effective measure: voltage, current ... ,connection :any ,1 and 3 phase .3) Display: 3 lines 4 digit LED to show the above ... TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay ...