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The Office for Product Safety and Standards (OPSS) is a world leader in Legal Metrology 鈥� the application of legal requirements to measurements and measuring instruments. It supports local government through its purpose-built laboratories in Teddington and upholds its statutory duties.

Our services

OPSS provides statutory calibration under the Weights and Measures Act 1985 and the Coinage Act 1971 on behalf of the Secretary of State. It checks the accuracy of the mass, length and volume of local standards held by local authorities and the UK鈥檚 coin standards for the Royal Mint. It also holds the trial plates for the UK hallmarking assay offices.

Read about our calibration service

OPSS, as the Secretary of State, and in relation to UK regulations under Section 12 of the Weights and Measures Act 1985, issues certifications for cubic measures, intoxicating liquor measuring instruments, dynamic axle weighers, and weighing instruments not using the action of gravity (for example gyroscopic NAWI) and used for legal purposes.

The equipment in the laboratories at our Teddington site is fully traceable to national standards and operated in accordance with ISO/IEC 17025:2017.

Access the lists of UK national certificates

Until 30 April 2022, OPSS published NMO branded certificates on 188体育 under the Measuring Instruments Regulations 2016, or the Non Automatic Weighing Instruments Regulations 2016, or for EEC type examination. These certificates are no longer updated by OPSS. Legacy 188体育 pages containing those certificates were unpublished on 20 July 2022. However, they remain available for reference and as a matter of public record on the National Archives.

鈥� National Archives website

鈥� National Archives website

鈥� National Archives website

Local Authorities should contact [email protected] to request copies of current/expired S.12 Pattern Approval Certificates.

Contact OPSS

For local authority enquiries please email [email protected].

For all other enquiries please email [email protected].

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