In the work, the bottom hole diameter D of the inner hole ring groove is often detected in the work as shown in Fig. 1. In particular, the accuracy of the bottom hole diameter of the inner cylinder ring groove of the cylinder rod seal guide sleeve is high (H9 grade), and the general gauge is difficult to measure or The accuracy cannot be guaranteed. The following describes an easy and accurate detector. The detector structure is shown in Figure 2, mainly by adjusting the claw 1, the caliper body
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