... series 3-phase True Effective Value Energy Meter(RMS)DW/MDW 3-line LED display 1) Input:true value single/three phase measure(bandwidth: up to 2 ... , production line for electrical parameters measurement.2) Features:voltage/ampere ratio set freely, ... and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter,Timer ...