Gage blocks are the primary method used by industry to standardize the measurement of dimension. This work discusses every aspect of gage block calibration, including definitions, characteristics of gage blocks, calibration by interferometry and mechanical comparison, and statistical process control techniques to assure the consistency and accuracy of calibrations.
and Beers, J.
The Gage Block Handbook, Monograph (NIST MN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=820735
(Accessed December 2, 2022)