What are telescoping gauges primarily used to measure?

Telescoping gauges are primarily used to measure inside diameters. These precision tools consist of two or more arms that can be extended or retracted to fit inside a cylindrical object, such as a pipe or hole. Once the gauge is properly fitted into the internal cavity, it allows the user to capture the measurement by using a micrometer or caliper to measure the distance between the points where the arms are in contact with the internal surface.

This capability makes telescoping gauges particularly effective for ensuring that internal diameters are accurate and consistent, which is critical for applications involving bearings, shafts, and other components where proper fit is essential for function.