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 A — micrometer

A micrometer is the appropriate precision instrument for measuring the thickness of thin shim stock. Unlike feeler gauges, which measure gaps, or rules, which lack sufficient resolution, a micrometer provides the necessary accuracy to ensure bearing clearances meet the manufacturer's specifications as required by 46 CFR Subchapter F.