weighing instrument #01314OIML In this Recommendation “mass” (or “weight value”) is preferably used in the sense of “conventional mass” or “conventional value of the result of weighing in air” according to OIML R 111 [5] and OIML D 28 [27], whereas “weight” is preferably used for an embodiment (or material measure) of mass that is regulated in regard to its physical and metrological characteristics.