Digital clamp meter measures AC current to 400 amp, AC and DC voltage to 600V, and resistance to 4 kilohms True RMS sensing meter provides accurate readings when measuring linear or non-linear loads, regardless of waveform Jaw opening measures current in a conductor up to 30mm without touching or interrupting the circuit Audible continuity sensor confirms that the circuit conducts electricity Meets IEC safety standard 61010-1, and is rated for CAT IV installations to 300V and CAT III installations to 600V.Maximum Operating Temperature:+50°C