A bore gauge is a precision measuring tool used to determine the internal diameter of a hole or cylinder. It typically consists of a set of calibrated rods or a dial indicator that can be adjusted to fit the bore's size. This tool is essential in various industries, including manufacturing and engineering, to ensure that parts meet specific tolerances. Bore gauges come in different types, such as dial bore gauges and digital bore gauges, each offering unique features for accuracy and ease of use. They help technicians and engineers maintain quality control by verifying that components fit together correctly and function as intended.