• International Comparisons Database

• Inter-American Metrology System (SIM) Technical Committee

• Links to Regional Metrology Organizations

• Links to other National Metrology Institutes

• NIST Policies and Positions on Key Comparisons

International Agreements and Legal Metrology

• CIPM Mutual Recognition Arrangement

• Other International Agreements

• International Organization of Legal Metrology (OIML)

• Metric Program

Traceability

• NIST Policy on Traceability

• Traceability to fulfill Federal Aviation Administration (FAA) Requirements

• NIST Services to provide Traceability

• NIST Reference on Constants, Units and Uncertainty

See Also

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NIST works to assure that the U.S. realization of the basic and derived measurement units is consistent with the realization in other nations. NIST Laboratories engage in a number of international activities to support trade and global science, and to promote the international acceptance of U.S. measurement standards.

International Agreements and Legal Metrology

• CIPM Mutual Recognition Arrangement — National metrology institutes of the International Committee of Weights and Measures (CIPM) have signed this international arrangement calling for "mutual recognition of national measurement standards."

• International Organization of Legal Metrology (OIML) — NIST serves as the U.S. representative to this 97-country treaty organization. OIML recommends performance requirements for measuring instruments, which nations may incorporate into their laws or regulations.

• Metric Program — This program helps to encourage the US transition to the metric system, the international standard for weights and measures.