It is a sensitive instrument used to measure the change in distance between two gauge points on either side of the slot and consists of a frame with a handle on one end and a dial gauge of 0.002 mm x 10 mm travel fitted at the other end. The frame carries a fixed conical reference point on the handle side and a moving conical point on the dial gauge side. The plunger of the dial gauge rests against this movable point.

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