Amprobe AC68C True-RMS 600A Clamp Meter Digital clamp meter measures alternating current (AC) to 600 amp, direct current (DC) to 600 amp, DC voltage and AC voltage to 600 volts (V), resistance to 4 kilohms, and frequency to 20 kilohertz (kHz) 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 a 1.5" (40 mm) jaw opening measures current without touching or interrupting the circuit Peak hold reading displays the maximum measurement of a current or voltage surge Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V