The REED R7400 is a rugged digital caliper built from hardened stainless steel, giving you precise inside, outside, depth, and step measurements from 0-6 in (0-150mm). Its large 6-digit LCD lets you switch instantly between inches and millimeters, while a locking slide and zero-set button keep readings steady and repeatable. An auto shut-off feature helps extend battery life for everyday shop or field use.