– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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CCM Working Group on Hardness (CCM-WGH)

Terms of reference

The terms of reference of CCM-WGH are:

    To advise the CCM on matters relating to hardness;

    To improve harmonization of primary standards developing new definitions and/or organizing pilot studies;

    To organize key comparisons for supporting the CIPM MRA;

    To support RMOs in implementing regional supplementary and key comparisons;

    To produce working documents for the evaluation of uncertainty;

    To maintain good links and interface with the hardness community (IMEKO TC5); and

    To provide formal liaison among organizations involved in standardization (ISO TC164/SC 3, ASTM-International Committee E28.06).


  • Dr Samuel R. Low  (NIST)


  • CENAM (Centro Nacional de Metrología)
  • GUM (Central Office of Measures)
  • INMETRO (Instituto Nacional de Metrologia, Qualidade e Tecnologia)
  • INRIM (Istituto Nazionale di Ricerca Metrologica)
  • KEBS (Kenya Bureau of Standards)
  • KRISS (Korea Research Institute of Standards and Science)
  • LNE (Laboratoire National de Métrologie et d'Essais)
  • NIM (National Institute of Metrology)
  • NIMT (National Institute of Metrology (Thailand))
  • NIST (National Institute of Standards and Technology, United States Department of Commerce)
  • NMIJ/AIST (National Metrology Institute of Japan, AIST)
  • NMISA (National Metrology Institute of South Africa)
  • NPL (National Physical Laboratory)
  • PTB (Physikalisch-Technische Bundesanstalt)
  • RISE (RISE Research Institutes of Sweden AB)
  • SMU (Slovak Institute of Metrology/Slovenský Metrologický Ústav)
  • UME (National Metrology Institute of Turkey)
  • VNIIFTRI (All-Russian Scientific Research Institute of Physical Technical Measurements, Rosstandart)
  • VNIIM (D.I. Mendeleyev Institute for Metrology)
  • VSL (VSL B.V.)

  CCM: Upcoming meetings
16–17 May 2019: 17th meeting of the CCM

CCM summary
General information
Members of the CCM
CCM working groups
CCM publications and bibliography
CCM Guidelines on final reports of comparisons
CCM strategy
Key comparisons
Open documents
CCM documents
CCM-WGG documents
CCM-WGH documents
CCM-WGPV documents
Workshop on the mise en pratique (Nov. 2012)