The MA440 is a 9 Function, 400A True RMS AC Clamp Meter and NCV detector. This clamp is a compact meter with a True RMS feature for accurate readings regardless of waveforms. 1.2" (30mm) jaw size fits conductors up to 500MCM. CAT III 600V safety rating. CE and ETL certified. Complete with test leads, three AAA batteries and pouch.