Amprobe ACDC-400 TRMS Digital Clamp Multimeter 400A AC/DC with VolTect Non-Contact Voltage Detection Digital clamp meter measures alternating current (AC) and direct current (DC) to 400 amp, AC voltage and DC voltage to 600 volts (V), resistance to 40 megaohms 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 Clamp with a 1.1" (27 mm) jaw opening measures current without touching or interrupting the circuit Relative zero mode stores a reading in memory to use as a zero point for subsequent readings, allowing quick comparison of multiple readings Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V Resistance measurement Relative measurement Accommodates conductors up to 1.18 inches (30mm) in diameter MAX/MIN recording Data Hold