The hole inspection is OK with this! "Plug Gauge - Special Plug Gauge"

[Concern] I want to measure whether the hole has worn and expanded. I want to determine its usability.

For simple shapes, measurement can be performed using the following methods: 1. Caliper measurement (approximate: 0.1 mm unit) 2. Measurement with a hole-specific micrometer (approximate: 0.01 mm unit) 3. Comparative measurement with block gauges and cylinder gauges (approximate: 0.001 mm unit) <For easy measurement> To measure the wear of a hole, preparing a dedicated measuring instrument (hereafter referred to as "gauge") is the quickest way. This allows for easy measurement and ensures that anyone measuring will obtain the same results. When it is not necessary to retain measurement values and simply determine whether the diameter of the hole is within the specified tolerance, a plug gauge is used. In the case of holes, if the degree of wear may vary depending on the depth position such as the entrance, middle, or back of the hole, it is necessary to measure with a dedicated cylinder gauge. Gauges are specially designed to match the measurement circumstances of the object being measured, making measurement very easy. To prevent wear from use, gauges implement the following measures on the sliding surfaces: 1. Hardening treatment 2. Surface treatment (e.g., hard chrome plating, TIN coating) 3. Use of carbide materials

Distance measuring device