Amprobe ACD-10-PLUS TRMS 600A Digital Clamp Meter Digital clamp meter measures alternating current (AC) to 600 amp, direct current (DC) voltage and AC voltage to 600 volts (V), capacitance to 3,000 microfarads, resistance to 40 megaohms, and frequency to 100 kilohertz 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 has jaws that are slimmer than standard clamp jaws, for improved access to tight areas, and measures current without touching or interrupting the circuit A relative zero mode stores a reading in memory to use as a zero point for subsequent readings Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V