... ,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 ... current clamp about 170g×3, roundcurrent clamp about 185g×3, test line about 250gTest Line Length1.5mCurrent Clamp Length2m×φ5mmWorking Temperature ...