Notation	Name	Description	Status
collectiveSt	Collective Standard	A set of similar material measures or measuring instruments f...	stable
inapplicable	inapplicable	None of the measurement standards are applicable.	stable
internationalSt	International Standard	Measurement standard recognized by signatories to an internat...	stable
nationalSt	National Standard	Measurement standard recognized by national authority to serv...	stable
primarySt	Primary Standard	Measurement standard established using a primary reference me...	stable
referenceSt	Reference Standard	Measurement standard designated for the calibration of other ...	stable
secondarySt	Secondary Standard	Measurement standard established through calibration with res...	stable
transferSt	Transfer Standard	Device used as an intermediary to compare measurement standar...	stable
travellingSt	Travelling Standard	Measurement standard, sometimes of special construction, inte...	stable
unknown	unknown	Measurement standard type is unknown.	stable
workingSt	Working Standard	Measurement standard that is used routinely to calibrate or v...	stable