... ,frequency,phase sequence,power 2.Upload Data:RS232 ETCR 4400 Three Phase Digital Phase Meter Features:Simultaneously measure ... voltage and current, frequency, phase sequence, active power, reactive power, apparent power, power factor, current vector sum, distinguish transformer wiring group ... Battery: 6pcs( alkaline dry battery : 1.5V AA); User Manual: 1 pc; Guarantee Card : 1 pc; Certification: 1 pc ...