What kind of gauges are used in musical instrument manufacturing

I am not a connoisseur, to the wooden musical instruments, I have seen:

Percentage meter (like a sickle axe on the flag of the sickle that kind),

Thickness gauge (percentage of the measurement of the thickness of the like, with the turner's common calipers can be),

Depth meter (not used when retracted, the kind of T, the turner vise drilling workers commonly used),

Arc meter (more stencils) (mainly stencil, but ready to arc meter)

Presumably because of mass production, each process has the process of processing the workpiece template.

For reference.

Brass instrument machining not seen.

Because there are different names commonly used for gauges in the community, are you talking about a micrometer with a micrometer head mounted on top of the base? Measuring accuracy is 1 thousandth of a millimeter? That's for machining millwork, and I don't see it used for wood instrument processing.