A dial gauge is a precision measuring instrument used to measure small distances or variations in size. It features a dial face with a needle that indicates measurements on a graduated scale. Dial gauges are commonly used in engineering and manufacturing to ensure parts meet specific tolerances. These devices can measure linear dimensions, such as the thickness of materials or the alignment of machinery. They are often used in conjunction with other tools, such as calipers or micrometers, to provide accurate readings in various applications, including quality control and mechanical inspections.