OIML Recommendation R 111-1:2004

Weights of classes E₁, E₂, F₁, F₂, M₁, M_1-2, M₂, M_2-3 and M₃

Scope: This Recommendation contains technical (e.g. principal physical characteristics) and metrological requirements for weights used: as standards for the verification of weighing instruments; as standards for the verification or calibration of weights of a lower accuracy class; with weighing instruments.