LINK-URI UTILE
Institutul National de Metrologie
International Organization of Legal Metrology
National Institute of Standards and Technology (NIST)
National Physical Laboratory (NPL)
Physikalisch-Technische Bundesanstalt (PTB)
Metrologie und Akkreditierung Schweiz (METAS)
EUROMET : European Collaboration in Measurement Standards
ILAC - International Laboratory Accreditation Cooperation
EA - European Accreditation
IEC - International Electrotechnical Commission
ISO - International Organization for Standardization