so the stuff on the table there is mostly for machinists to check their work. Only a handfull of tools/ gauges needed by armourers to inspect.
A lot of tools and gauges would of been the calibration gauges or tool room gauges, the QC inspector would have had a set for whatever part of the process he was involved in, then the fitter/ turner would have a set of gauges for the part he was involved in.