Amprobe ACD-41PQ 1000A Power Quality Clamp Meter with Temperature Digital clamp meter measures alternating current (AC) to 1,000 amp, direct current (DC) voltage and AC voltage to 600 volts (V), resistance to 1,000 ohms, 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 1.77" (45 mm) jaw opening measures current without touching or interrupting the circuit K-type thermocouple probe measures temperature Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V