Watch Video of this site: https://youtu.be/8uIdrE1p9Ro Dial Bore gauge is used to measure the inner diameter. Bore Dial Gauge use to measure the inner diameter of the hole, it is gauge fitted with a plunger dial gauge. Bore dial gauge used within the standard range that means bore dial gauge have a standard set of pins(anvils) with a variable range of up to 2 mm