... 8 segments output control DW series Single phase Electric Meter(vol/ampere/power/frequency/power factor) Features ... ordering. Transformed analog output 4-20mA for any selectable electrical parameters.4) Communication:RS485 ... Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, ...