Chicago Brand Telescoping Bore Gauges

Telescoping gauges are used to gauge large holes and to measure inside distances. These gauges are equipped with a plunger that can be locked in the measuring position by a knurled screw or locking nut in the end of the handle. Measurements must be calipered on the gauge by a micrometer. They are also used when measurements cannot be taken with a standard micrometer. Telescoping gauges are particularly adaptable for roughly bored work and odd sizes and shapes of holes.