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In the inspection work, the measurement problem of the small hole is often encountered. Some inspectors directly measure the small-sized inner hole of φ10 mm or less with a knife-shaped inner claw of a three-way vernier caliper with a graduation value of 0.02 mm at the time of detection, and often find that the smaller the hole, the more difficult the dimension is to be measured. However, the correct measurement position is neglected so that the direction of movement of the gage probe is consistent with the direction of the measured dimension. I wanted to make the measured pore size close to the real value, but