(NIST: Gaithersburg, MD) -- As part of the National Institute of Standards and Technology (NIST), the Office of Weights and Measures (OWM) is responsible for harmonizing international and national documentary standards with those used by the U.S. weights and measures community.

Therefore, in 2019, OWM worked with the weights and measures community that regularly uses NIST Handbook 105-1 (1990), Specifications and Tolerances for Field Standard Weights to begin phasing out NIST Class F mass standards and utilizing the OIML R 111-1 (2004) aligned specifications and requirements found in ASTM E617, Standard Specification for Laboratory Weights and Precision Mass Standards.

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