etalon, mis on sisse seatud primaarse tugiprotseduuri alusel või loodud lepinguliselt valitud artefaktina, etalon, mis on nimetatud või mida laialdaselt tunnustatakse parimate metroloogiliste omadustega etalonina ja mille väärtust aktsepteeritakse lähtumata sama suuruse mingi teise etaloni väärtusest, measurement standard established using a primary reference measurement procedure, or created as an artifact, chosen by convention, measurement standard which has the highest metrological qualities in a specified field, measurement standard that is designated or widely acknowledged as having the highest metrological qualities and whose property value is accepted without reference to other standards of the same property or quantity, within a specified context