This paper discusses the invention of Vernier calliper, its working and applications in various types of jobs. Life in the 21st century completely relies on precise measurement. Each estimation is an examination between an amount we need to know and the standard amount. This examination paper essentially informs us regarding the procedure of estimation and how it changed amid the time. Vernier calliper is a gadget used to quantify the separation between two inverse sides. We have inquired about everything from its history to its present, and we additionally have done some new reasoning on this, with the goal that we can enhance its utilization. So in this, we use scanner which scan the error that is like in dimension, shape which make the vernier calliper more accurate to use.