The Digital Caliper gives instant readings in inches or millimeters. Easy to use and easy to read. Has a range from 0-6" and accuracy to ± 0.001" or. 02mm. Jaw depth measures 1-1/2" outside, 5/8" inside. Hardened stainless steel body lock holds slide in position for measuring constants. Includes a 1.55-volt silver oxide battery and fitted plastic storage case.