What tool is used to inspect if holes have been properly enlarged?

The Go/NoGo gauge is specifically designed for validating whether a hole has been enlarged to the correct specifications. This type of gauge provides a straightforward mechanism for checking tolerances: the "Go" side should easily fit into the hole if it is appropriately sized, while the "No Go" side should not pass through if the hole is within the required limits. This dual-functionality simplifies the inspection process, enabling mechanics to quickly determine if further operations are needed.

In contrast, while other tools like calipers, micrometers, and rulers can measure dimensions, they typically allow for more variability in measurements. These tools are generally used for precise measurements rather than for passing a definitive test as is required in certain inspection scenarios. Calipers and micrometers provide numerical measurements but do not classify the acceptance of dimensions in a pass/fail manner, making the Go/NoGo gauge the most appropriate choice for this inspection task.