To check the thickness of a piece of thin shim stock before using it to make a bearing shim, you should use a __________.

Correct Answer: Option C — micrometer

Micrometers provide the high-precision measurement required for verifying shim stock thickness, which often involves tolerances within thousandths of an inch. Unlike rules or feeler gages, a micrometer offers the necessary accuracy to ensure bearing clearances remain within the manufacturer's specified tolerances as required by 46 CFR maintenance standards.