... -phase True Effective Value Energy Meter(RMS)DW/MDW 3-line LED display 1) Input:true value single/three phase measure(bandwidth ... ,mini power is 1mW,apply to energy-saving equipment, production line for electrical parameters measurement.2) Features:voltage/ampere ratio set ... - factors,three-phase three wire two factors, three phase four-wire selectable.3) Output:3-line alarm output configurable,up to 8 ...