​​International & Regional Metrology Organisations

 Physikalisch-Technische Bundesanstalt (PTB), the Germany metrology also has a good diagram showing international and regional metrology organisations. 

​​International Metrology Organisations

OIML – The International Organization of Legal Metrology
OIML is an intergovernmental treaty organization which

• develops model regulations, standards and related documents for use by legal metrology authorities and industry,
• provides mutual recognition systems which reduce trade barriers and costs in a global market,
• represents the interests of the legal metrology community within international organizations and forums concerned with metrology, standardization, testing, certification and accreditation,
• promotes and facilitates the exchange of knowledge and competencies within the legal metrology community worldwide,
• cooperates with other metrology bodies to raise awareness of the contribution that a sound legal metrology infrastructure can make to a modern economy.

BIPM – Bureau International des Poids et Mesures
The mission of the BIPM is to ensure and promote the global comparability of measurements, including providing a coherent international system of units for:

• Scientific discovery and innovation,
• Industrial manufacturing and international trade,
• Sustaining the quality of life and the global environment.

The unique role of the BIPM enables it to achieve its mission by developing the technical and organizational infrastructure of the International System of Units (SI) as the basis for the world-wide traceability of measurement results. This is achieved both through technical activities in its laboratories and through international coordination.

​Regional Metrology Organisations

WELMEC – ‘European Cooperation in Legal Metrology’
WELMEC members are the national legal metrology authorities in the European Union and European Free Trade Agreement member countries, whilst national legal metrology authorities in those countries that are in transition to membership of the EU are associate members.

The goals of WELMEC are to:
 -  develop mutual confidence between the legal metrology authorities in Europe
 -  harmonise legal metrology activities
 -  foster the exchange of information between all bodies concerned

WELMEC advises the European Commission and the Council regarding the application and further development of Directives in the field of legal metrology, for example the Measuring Instruments Directive and the Non-Automatic Weighing Instruments Directive.

SIM – ‘Inter-American Metrology System’

The Inter-American Metrology System, Sistema Interamericano de Metrologia. SIM is the Regional Metrology Organisation for the Americas Created to promote international, particularly inter-American, and regional cooperation in metrology, SIM is committed to the implementation of a global measurement system within the Americas, in which all users can have confidence. Working towards the establishment of a robust regional measuring system,

SIM covers legal metrology issues in the Americas. The objective of the Legal Metrology Working Group is the harmonisation of legal metrology requirements and activities in the Americas in consideration of OIML Recommendations and Documents.

AFRIMETS – ‘Intra-Africa Metrology System’
To harmonise metrology activities in Africa, an intra-Africa metrology system (AFRIMETS) was established.

In order to represent the whole continent effectively and efficiently it is built on sub-regional metrology cooperation’s. AFRIMETS covers both scientific, industrial and legal metrology with the following objectives: 

 -  Satisfy and sensitize customers and stakeholders, which include the recipients of services, the International Bureau of Weights and Measures (BIPM), African countries, NMIs, RMOs, Governments, industry and consumers; 
 -  facilitate trade; 
 -  deliver value for money for measurements;
 -  increase number of services;
 -  facilitate consumer protection, health, safety and the protection of the environment;
 -  integrate the needs of members / stakeholders;
 - sensitize customers and stakeholders about international requirements.

​​Other Interested Organisations

APMP – The Asia Pacific Metrology Programme
The Asia Pacific Metrology Programme (APMP) is a grouping of national metrology institutes (NMIs) from the Asia-Pacific region engaged in improving regional metrological capability through the sharing of expertise and exchange of technical services among Member laboratories. APMP is also a Regional Metrology Organization (RMO) recognized by the International Committee for Weights and Measures (CIPM) for the purpose of worldwide mutual recognition of measurement standards and of calibration and measurement certificates.
 
MSA – Metrology Society of Australasia
The MSA is an association of professional metrologists, engineers, scientists, technicians and measurement experts throughout Australia, New Zealand and around the world, who measure, evaluate, calibrate, maintain, educate and train, design, sell, invent and develop measurement technologies and the Science and Art of Metrology.

APEC – The Asia Pacific Economic Cooperation 
The Asia-Pacific Economic Cooperation (APEC) is a regional economic forum established in 1989 to leverage the growing interdependence of the Asia-Pacific. APEC's 21 members aim to create greater prosperity for the people of the region by promoting balanced, inclusive, sustainable, innovative and secure growth and by accelerating regional economic integration.