The ACCUD Outside Spring Caliper 150mm (AC984-006-01) is a precision measuring tool designed for accurate external diameter measurements of cylindrical objects. Featuring a spring-loaded mechanism for consistent tension, this forged steel caliper provides reliable measurements up to 150mm with fine adjustment through its knurled screw. The polished legs ensure smooth operation while the hardened tips maintain accuracy through repeated use. Ideal for machinists, metalworkers, and quality control professionals, this caliper offers a traditional yet effective solution for workshop measurements where digital tools may be impractical.