Amprobe ACD-16 TRMS-PRO 1000A Data Logging 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, and frequency to 500 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 1.77" (45 mm) jaw opening measures current and frequency without touching or interrupting the circuit Data logging feature captures the highest and lowest readings in every one-minute time interval over a period of time up to 5,400 minutes Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V