Measures, computes, and displays 3-Phase Power on Balanced or Unbalanced Loads The Extech 382075-NIST is a 3-Phase TRMS Clamp-on power analyzer which can be used on 3- and 4-wire balanced or unbalanced loads. It can measure reactive and apparent power to 1200kW. Additional measurements include: watts, voltage, current, frequency, power factor and phase angle. It can display lead, lag current and voltage phase shift in degrees and store/recall the last 4 readings. Features include: DC current auto zero, data hold, min/max, and relative mode. With NIST Calibration