StacksVerified U.S. regulatory reference

40 CFR §1065.790

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)PM balance calibration weights. Use PM balance calibration weights that are certified as NIST-traceable within ±0.1% uncertainty. Make sure your highest calibration weight has no more than ten times the mass of an unused PM-sample medium.
  2. (b)Dynamometer, fuel mass scale, and DEF mass scale calibration weights. Use dynamometer and mass scale calibration weights that are certified as NIST-traceable within ±0.1% uncertainty.