Which tools are used to measure the inside diameter of a small hole?

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Multiple Choice

Which tools are used to measure the inside diameter of a small hole?

Explanation:
To measure the inside diameter of a small hole, you need a tool that can reach inside and contact the bore, plus a precise reader to determine the size. A small hole gauge is inserted into the hole and expanded until it just fits the bore; then you withdraw the gauge and measure its span with a micrometer caliper. The micrometer’s reading gives the hole’s inside diameter. Other options don’t provide the correct combination: they either measure outside dimensions, measure depth, or measure radii rather than the actual internal diameter.

To measure the inside diameter of a small hole, you need a tool that can reach inside and contact the bore, plus a precise reader to determine the size. A small hole gauge is inserted into the hole and expanded until it just fits the bore; then you withdraw the gauge and measure its span with a micrometer caliper. The micrometer’s reading gives the hole’s inside diameter. Other options don’t provide the correct combination: they either measure outside dimensions, measure depth, or measure radii rather than the actual internal diameter.

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