Extech 382075-NIST - NIST Calibration Certificate - 2000A TRMS 3-Phase Power Analyzer Clamp Meter features: Measures, computes, and displays 3-Phase Power on Balanced or Unbalanced Loads; Display Lead/Lag Current/Voltage phase shift in degrees; Store/recall last 5 readings; DC Current Auto-Zero; Dual displays: kW+PF, kVA+kVAR, phase-angle+Hz, Volts+Hz, or Amps+Hz; etc.