A Vernier is a precision measuring instrument used to obtain accurate measurements of length. It consists of a main scale and a sliding scale, known as the Vernier scale, which allows users to read measurements with greater accuracy than a standard ruler. The Vernier scale typically provides measurements to a fraction of a millimeter or inch, making it useful in various fields such as engineering and science. The Vernier caliper is a common type of Vernier used to measure internal and external dimensions, as well as depths. It features two jaws for gripping objects and a depth probe for measuring depth. This tool is essential in workshops and laboratories where precise measurements are crucial for quality control and experimentation.