This digital caliper covers a full 0-12 in / 0-300 mm range with 0.0005 in (0.01 mm) resolution, built around a hardened stainless steel head and body for shop-floor durability. It handles outside, inside, depth, and step measurements from one tool, with a zero-set button and slide lock screw for quick, repeatable readings on a 5-digit LCD. It runs on a replaceable CR2032 battery with auto shut-off and ships in a hard carrying case, and this unit includes a traceable NIST calibration certificate for audit-ready accuracy records.