Mechanical Calibration Shop

It probably depends on which tools. Pressure gages and force should be "traceable to the National Bureau of Standards". This appears on master gages used for calibration in industrial settings. You might check with them.

Pressure gages can be set with dead weight testers. Dead weight testers normally can't be calibrated and don't need to be. They cost anywhere from $1500 to $2500. I bought one on ebay for $75 but it has no weights with it. All is not lost. The spindle and platform alone constitute a pressure measurement of 25 lb. I intend to use Petri dishes and bird shot to make up a set of weights for the tester using the spindle and platform for a reference.

For low pressures InHg or InH20 you would of course use a manometer which again is not calibrated.

It appears the name of the Bureau has been changed to the National Institute of Standards and Technology. http://www.nist.gov/ You should find what you want there.

If you don't have a dead weight tester, or any way of in-house calibration for your other instruments, you can send then out to independent calibration labs. Basically, put together a set of new instruments, send them out to a certified calibration lab. The lab will send you a "certified calibration report". Mark these your "primary standards" and keep these under lock and key. Compare to your primary and make up a set of "secondary standards", that you use for every day calibrations. Keep them well protected in your lab, never to leave. You can then compare your working instruments to these. That way they will be directly traceable to a lab standard. The spec I work to (AMS2750D) requires that my "standards" be sent out for calibration every 2 years. My "secondary standards" must be calibrated every year,(from my primary). Anyway, my spec is different from yours, as I work to the standard for furnace control, but I could get that standard for you, I'll have to poke around.