What tool is used to measure part movement and out-of-round in thousandths of an inch?

The dial indicator is specifically designed for measuring linear displacement and is ideal for assessing part movement and out-of-roundness with precision. It features a dial face that moves in conjunction with a plunger, allowing for clear readings in thousandths of an inch. This level of precision is crucial in auto body repair, where even minor discrepancies can impact fit, finish, and performance.

In contrast, calipers and micrometers, while also used for measuring dimensions, have different applications; calipers are typically used for measuring larger external dimensions or internal dimensions, but may not provide the same level of sensitivity for tracking small movements. Micrometers offer fine measurements but are primarily for thickness or diameter rather than movement or out-of-round checks. A level is utilized for ensuring surfaces are even and plumb rather than measuring any form of roundness or displacement. Therefore, the dial indicator is the most accurate and appropriate tool for this specific measurement task.