Vernier caliper:

Vernier caliper , instrument for making very accurate linear measurements introduced in 1631 by Pierre Vernier of France. It uses two graduated scales: a main scale similar to that on a ruler and an especially graduated auxiliary scale, the vernier , that slides parallel to the main scale and enables Learn the basics of using a vernier caliper , a precision instrument for measuring internal and external dimensions. Find out how to read the main and vernier scales, compensate for zero error, and avoid common mistakes. A Vernier Caliper is a precision measuring instrument used to measure internal and external dimensions, depths, and step measurements with high accuracy. Learn what a vernier calliper is, how it works, and how to use it for measuring linear dimensions and diameters. Find out the least count, zero error, and applications of vernier callipers with solved examples and diagrams.