Gauge for indirectly measuring distance between special surface and center of round hole

The utility model discloses a gauge for indirectly measuring the distance between a special surface and the center of a round hole, relates to the technical field of gauges, and particularly relates to a gauge for indirectly measuring the distance between the special surface and the center of the round hole, which comprises a dial indicator, an inner hexagon bolt, a main body, a part to be measured, an inserting rod, a spring, a round ball and a standard part to be measured, wherein the main body is provided with a threaded hole, a cylinder B, a cylinder bottom surface, a deep hole, a cuttinggroove and a square hole, the part to be measured is provided with a counter bore bottom surface A, a hole A, a central point A and a large hole, the inserting rod is provided with a guide surface A,an arc surface, a guide surface B and a lower plane, and the standard part to be measured is provided with a counter bore bottom surface B, a hole B and a central point B; wherein the ball sinks intoa deep hole of the main bod