What is direct reading instrument does that apply to the caliper?

A direct reading instrument that applies to a caliper is a vernier caliper. This tool allows users to measure the dimensions of an object, such as length, width, and depth, with precision. It features a main scale and a sliding vernier scale that provides a direct reading of measurements, often to within a fraction of a millimeter or inch. This enables quick and accurate measurements without the need for additional calculations.