This depth micrometer is designed for precise groove, step, hole, and surface depth measurements across a wide 0-22" range. It features a mechanical design with clear markings for easy reading and does not require batteries. The set includes interchangeable measuring heads and extension rods to handle different workpieces and measuring tasks. Its metal construction and stainless-steel contact components are built for dependable workshop and field use. A hard carrying case is included to keep the kit organized and protected.