Hardened stainless steel body. Switches from inches to millimeters instantly. Range of 0-6"/0-150mm. Accuracy +/0.001"/ 0.02mm. Resolution: 0.0005"/0.01mm. Large, easy to read numbers reduces errors. Adjusts to zero at an......Hardened stainless steel body. Switches from inches to millimeters instantly. Range of 0-6"/0-150mm. Accuracy +/0.001"/ 0.02mm. Resolution: 0.0005"/0.01mm. Large, easy to read numbers reduces errors. Adjusts to zero at any position. Measures internal, external, depth and step dimensions. Jaw depth measures about 1-½" outside, 5/8" inside. Lock holds slide in position for measuring constants. Battery included. Low battery indicator. 87323 Electronic Digital Caliper