Er.Seema on Instagram: "In this video we will see about the mechanical measuring instruments with beautiful animation. 1. Dial Gauge A dial gauge (also called a dial indicator) is a precision measuring instrument used to detect very small linear movements or deviations—usually in microns (µm). 2. Screw Gauge A screw gauge is a precision measuring instrument used to measure very small dimensions such as the diameter of wires, thickness of sheets, or small components with high accuracy. 3. Vernier