General Technologies Corp GTC CM100 1 mA to 100 Amps AC/DC Low Current Clamp Meter AC/DC current measurement from 0.001 up to 100 A. which makes it a great tool for measuring parasitic draws and AC/DC voltage measurement up to 600 volt Small jaw: 1.2 inches (W) x 0.53 inches (D) (300x13.4millimeters) with clamp opening up to 1/2 inch (12.5 millimeters) Peak and Data hold functions with one rotary switch operation 2 readings per second sampling and continuity check with audible indicator Test leads soft carrying deluxe pouch and batteries included