Selecting a Bore Gauge on Amazon.com
A bore gauge, also known as a bore gage or hole gauge, measures the distance between two or three sides of a hole, called a bore, in any type of object or material, including pipes or barrels, to ensure that the bore is a specified shape and diameter. With extension rods, a bore may be measured at any depth. Applications for bore gauges include firearm and engine repair, construction, and industrial equipment maintenance. A bore gauge designed for automotive applications is known as a cylinder bore gauge.
When selecting a bore gauge, major attributes to consider are type of display, application, the range measured, and the accuracy and precision required.
A simple bore gauge, such as a telescoping gauge, works by being fitted to the inside of a bore, then removed and measured against a caliper. More complex gauges take the measurement and provide a reading directly through a vernier, dial, or digital display. A dial bore gauge is the most common type.