An 18-inch analog vernier caliper is a precision measuring instrument designed for accurate measurement of external dimensions, internal diameters, depths, and step distances on large workpieces. It features a finely graduated main scale and a vernier scale that allow users to obtain precise readings without the need for batteries or electronic components. Manufactured from hardened stainless steel, it offers excellent durability, corrosion resistance, and long-lasting accuracy in demanding environments. The smooth sliding jaw and secure locking screw ensure stable and repeatable measurements. It is widely used in machining, engineering, fabrication, automotive repair, quality control, workshops, and industrial maintenance for reliable dimensional inspection.