Round feeler gauge for accurately and visually measuring aperture

The utility model relates to the technical field of measuring equipment, and discloses a round feeler gauge for accurately and visually measuring aperture, which comprises a cone measuring body, a first groove body is arranged on the surface of the cone measuring body, and a first measuring block is arranged in the first groove body; according to the utility model, the measuring scale is arranged in the connecting sleeve and is matched with the first clamping block and the second clamping block, so that the round feeler gauge has the function of measuring the pipe diameter wall thickness, external equipment is not needed, the functionality and the convenience of the device are improved, the cost of purchasing measuring tools for measurement is reduced, and the measuring efficiency is improved. The first measuring block and the second measuring block are respectively mounted on the surface of the conical measuring body, so that when the first measuring block and the second measuring block extend, the measuring