Anyone ever wonder if the inspection tools being used by your local HD tech or the factory are calibrated periodically? And if so, assuming they have a Quality Management System, how often are calibrations called out? 
Unfortunately, the "techs" at my dealer weren't capable of utilizing measurement devices more sophisticated than a yard stick. And they only used that to prop the toolbox lid open.
The typical tech who owns his own gauges probably does not send them out for a yearly calibration/certification. Depending on how much they are used, and how they are stored when not in use, it probably isn't as necessary as it is in a manufacturing setting where the tools are used continuously. In most cases an individual can just use a set of certified standard gauge blocks to "self certify" micrometers, calipers, dial indicators, etc. Torque wrenches should be sent out for professional calibration, but it probably happens rarely if at all.
I would imagine the MoCo is like most other ISO9001 compliant manufacturers, with a full metrology program which would include certification of all measurement tools to standards traceable to the International Bureau of Standards. Of course, that still doesn't guarantee that the inspections will be done properly (measurement error) or that proper decisions will be made when out-of-tolerance issues are detected.
Jerry