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In order to construct an inside gauge, gauge blocks and jaws are wrung together and mounted on a holder. This inside gauge is inserted into a hole to measure its internal diameter.The process of measurement consists in varying the sizes of the gauge blocks by steps of 1μ until a nice fit is obtained. By this method it takes long time to measure internal diameter precisely. On the other method, an inside gauge is constructed slightly smaller than the diameter of hole. And one jaw is kept to be contact to the wall of the hole, while other can he swung in the hole. The displacement of the movable jaw is measured by a dial gauge to obtain the internal diameter. Through the latter method, the measurement is very simple and carried out rapidly. In this report it is described how rapidly and.accurately the measurement can be carried out by the latter method.