| oiml.org | International Organization of Legal Metrology |
| nist.gov | National Institute of Standards and Technology (NIST) |
| iso.ch | ISO. International Organization for Standardization |
| iec.ch | International Electrotechnical Commission |
| iaf.nu | International Accreditation Forum, Inc. |
| european-accreditation.org | Ea - European Co-operation For Accreditation |
| euromet.org | Introduction To Euromet |
| eoq.org | European Organisation For Quality : The Organisation For Quality Standard In Eu |
| cenorm.be | The European Committee for Standardization (CEN) |
| bipm.fr | Bureau international des poids et mesures |
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