General Technologies Corp GTC CM600 600 Amps AC/DC Current Clamp Meter AC/DC current measurement up to 600 A and AC/DC voltage measurement up to 600 volt Clamp opens up to 1 inch (25.4 millimeters) Peak and Data hold function 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