Great. To measure string diameter you're gonna need a 0-1 inch mic, to measure width @ the nut you're gonna need a 1-2 inch mic, for nut widths over 2" you'll need a 2-3 inch mic, to measure soundhole diameter you'll need a set of inside diameter mics.
For quality measuring instruments, for (much finer) measurements,we're already at about a grand.
A set of good digital calipers will do it all for a "C" note.
I'm a machinist.
Steve