Transformer jaws accept conductors up to 0.9” diameter and measure True RMS AC/DC current to 400A and frequency to 1000KHz. It features min/max, data hold and a one touch zero for DC amps. Unit operates on 2 “AA” batteries (included), measures 7” x 1.75” x 1.25” and weighs 8 oz. Comes complete with manual, carrying case and 1 year warranty.