Which instrument is employed to inspect holes in the assembly?

The Go/NoGo gauge is the appropriate instrument for inspecting holes in assembly because it is specifically designed to determine whether a feature meets specified tolerances. This type of gauge provides a quick and effective means of checking for compliance without the need for precise measurements.

In the context of holes, the Go/NoGo gauge will have two components: the "Go" side, which should fit into the hole if it is within the acceptable tolerance, and the "NoGo" side, which should not fit if the hole is correctly sized. This binary nature allows mechanics to quickly assess whether the hole is too large, too small, or just right, thus ensuring that parts will fit together as intended during assembly.

Other instruments mentioned, like calipers and micrometers, while useful for measuring dimensions, may not provide the same binary assessment as Go/NoGo gauges. Calipers offer continuous measurements and can indicate exact dimensions, making it somewhat less efficient for quick pass/fail decisions. Micrometers are highly precise but are also not built specifically for the rapid inspection that Go/NoGo gauges offer in assembly contexts. Depth gauges measure how deep a hole is but do not assess its width or diameter, which is crucial for hole compliance.

Therefore