6 inch Stainless Steel Digital Caliper in plastic storage box. Increments are 1/64 inch, 0.0005 inch, and 0.01mm. Measures in Fractional and Decimal inches as well as in millimeters. It measures inside, outside, and depth dimensions. Uses one LR44/AG13 battery, which is included. Note: this caliper will not work in extremely bright light. It worked everywhere in our shop except in our photographic light table, where the reading went wacky.