I have 30 Pin Gage sets to "calibrate". They are all 3 decimal place (X.XXX) and either a + or - accuracy. My plan is to use a calibrated caliper, that measures to 4 decimal places, that we maintain as a standard, not used for production, with documentation, a certificate of calibration and variable data traceable to NIST. Is there a standard in the world of calibration such as ISO, ANSI, etc. that would specifically not permit me to use calipers to verify the accuracy of each pin. The pins are not use for final inspection, that is done by QC, at the end of the manufacturing process. Our product dimensional tolerance is measured to a maximum of 3 decimal places and the tightest tolerance is +/- .005".