... voltage channels and current channels. DF-301 three-phase meter takes single chip as kernel, adopts three separate voltage channels ... with seven functions: voltmeter, ammeter, phase meter, phase sequence meter, frequency counter, power meter, power factor meter.2. Display vector figures with six angles ... .init( { 'aImgSrc': aBigImageSrc } ); } )(); Hot Sale! DF-301 Portable Three-Phase Meter