The plug gauge is generally used to inspect the workpiece aperture for mass production. The plug gauge is usually made in one piece. The material is made of T10A and the thickness is 8~10mm. In the work, after a large amount of use, the gauge plug is worn out after the probe is worn out, and needs to be replaced, so that the whole is scrapped and the material is wasted. The overall manufacturing cycle is long and it is not conducive to timely replacement. To this end, we have improved the design of the chip plug as shown in Figure 1 and Figure 2.