The thickness of a substance, such as metal, wood, plastic, glass, or other materials, can be measured using a thickness gauge. It is employed to gauge a material's thickness in order to ascertain its size and shape, for the purpose of comparison, or for quality control. The sort of thickness gauge to use depends depend on the material being measured. Thickness gauge is available in different shapes and sizes. The thickness of materials is measured using both analogue and digital gauges.