40 CFR § 1065.790
Mass standards
June 9, 2020
(a) PM balance calibration weights. Use PM balance calibration weights that are certified as NIST-traceable within 0.1% uncertainty. Calibration weights may be certified by any calibration lab that maintains NIST-traceability. Make sure your highest calibration weight has no greater than ten times the mass of an unused PM-sample medium.
(b) Dynamometer calibration weights. [Reserved]
[70 FR 40516, July 13, 2005, as amended at 76 FR 57467, Sept. 15, 2011]
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