Answer :
Final answer:
The best tool to measure the depth of a 3/8 inch diameter counter-bore is a depth micrometer due to its design to specifically measure depths accurately.
Explanation:
The depth of a 3/8 inch diameter counter-bore can best be measured with a depth micrometer. A depth micrometer is specifically designed to measure the depth of holes, slots, and recesses, making it the most suitable tool for this task. Other instruments like dial calipers, gage pins, or dial test indicators can be useful for different types of measurements, but for depth specifically, the depth micrometer provides accuracy and ease of use aligned with the demands of the task.
