With a short stem, these gauges easily maneuver in shallow holes and are compact enough to slip into your pocket. Use them to check the diameter and roundness of a hole. They are comparison gauges—the dial will display the magnitude of variation from the set measurement. Set your desired measurement with a ring gauge, bore gauge calibrator, micrometer, or caliper.

The anvil on the gauges extends out and contacts two points to take measurements. Swap the included anvils to measure bores with different diameters. These gauges have hollow grips for easy handling. They also prevent body heat from causing the material of the gauge to expand and impact accuracy. A plastic cover on the dial protects it from drops and scratches.