... line LED display 1) Input:true value single/three phase measure(bandwidth: up to 2.5KHz) more than ... , input isolation among phases,single/three phase three-wire three- factors,three-phase three wire two factors, three phase four-wire selectable.3) Output: ... power distribution,building automation,eg.,single/three phase,voltage/current/power,three phase voltage/ampere integrated display control or ...