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