Amprobe ACD-45PQ 600A Power Quality Clamp Meter with True-RMS Digital clamp meter measures alternating current (AC) to 600 amp, direct current (DC) voltage and AC voltage to 600 volts (V), resistance to 1,000 ohms, and frequency to 500 hertz (Hz) True RMS (root mean square) sensing meter provides accurate readings when measuring linear or non-linear loads, where the current or voltage has a sinusoidal or nonsinusoidal waveform Transformer clamp with 1" (26 mm) jaw opening measures current without touching or interrupting the circuit Measures real power, reactive power, apparent power, power factor, and kilowatt hour (kWHr) usage of single- or three-phase balanced or unbalanced power sources Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V Measurements: AC/DC Voltage up to 600V, AC current up to 600A, resistance, frequency power 3 phase unbalanced load measurement - calculation of the discrete single phase measurements Auto VA - auto selection of AC volts, DC volts or AC amps Ultra slim jaws accommodate conductors up to 1.02 (26mm) in diameter Optional PC interface capability (RS-232 KIT2)