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Abstract-On the topic design of instruments, we have selected the topictaper gauges.A new instrument to measure bore diameter of any given specimen in a simple and precise manner. This instrument is named as "Taper Gauges" which is nothing but sets of tapered metal rods of some standard angles on which the measurements are made based on certain constants for that instruments depending upon the taper angle the work piece used. Taper gauges are the precise instruments to measure the bore diameter of any circular cross section with least count of 0.01 mm for 5.74° tapering. On decreasing the taper up to the angles of 1°, we can increase the precision of the instruments up to 0.001mm. Hence the accuracy will be more. Later it can be used on calipers for further improvements. Eventually it will be digitalized.