... ,current,phase,frequency,phase sequence,power 2.Upload Data:RS232 ETCR 4400 Three Phase Digital Phase Meter Features:Simultaneously measure three-phase AC voltage, current, phase, frequency, phase sequence ... with disabled backlight, battery working continuously for about 16hoursDisplay ModeLCD display, 240dots×160dotsMeter SizeLength, Width, Height:196mm×92mm×54mmClamp Sizeround current ...