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What are the parts of a telescopic gauge?

Shop for Telescopic Gauges

Parts of a telescopic gauge: internal spring, locking screw, handle and telescopic rods

Locking screw

Locking screw on a telescopic gauge The locking screw, at the bottom of the telescopic gauge, governs the movement of the telescopic rods. When the locking screw is turned anticlockwise it releases the spring attached to the rods so that they can move around freely.
Measuring a telescopic gauge with a micrometer When the locking screw is turned clockwise, the rods are locked in position, allowing the user to accurately measure the telescopic rods with a micrometre or vernier calliper.

Telescopic rods

Telescopic rods on a telescopic gauge Telescopic rods are the parts which measure the diameter of a bore.There is a telescopic rod on either side of the head on a telescopic gauge. The rods are attached to a spring which enables them to move in and out of their casing.
Radius edge on a telescopic rod The ends of the telescopic rods are in the shape of a half ball, known as a radius edge, to allow them to measure the surface of a bore more accurately.

Internal Spring

Spring The internal spring is attached to the telescopic rods and the locking screw. This is the part of the telescopic gauge which enables the telescopic rods to move.


Handle on a telescopic gauge The handle is made with added ridges, known as a knurl, on the outside to provide added grip. The handle can be either 60mm (2.4″), 203mm (8″), or 305mm (12″) in length.

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