... segments output control DW series Single phase Electric Meter(vol/ampere/power/frequency/power factor) Features: 1) Input ... power distribution,building automation,eg.,single/three phase,voltage/current/power,three phase voltage/ampere integrated display control or ... Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer,Timer Relay, Solid State Relay, Proximity ...