Standard (metrology)
REALIZATION OF THE DEFINITION OF A GIVEN QUANTITY USED AS REFERENCE
Measurement standard; Secondary standard; Secondary reference standard; Primary reference standard; Laboratory standard; Lab standard; Etalon (metrology); National etalon; International etalon; National reference standard; International reference standard; Hierarchy of Standards; Hierarchy of standards
In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity.Phillip Ostwald,Jairo Muñoz, Manufacturing Processes and Systems (9th Edition)John Wiley & Sons, 1997 p.