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5. Off-system units
Units that do not belong to the international system are referred to as units outside the system.
The use of some of them is legal because of their importance or usefulness in particular fields.
5.1 Units in use with the international system
The CIPM recognized that SI users will need to use certain units which are outside the SI, but which play an important role and are widely used. These are shown in tables 4 and 5 .
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Off-system units
Defining units
Bibliography
Standardization
The Association française de normalisation (AFNOR) provides readers with collections of French, foreign and international standards, which can also be purchased from AFNOR. In each country, the national standards body can provide the same services.
France
French Standards Association (AFNOR)
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Websites
Main organizations responsible
International Organization of Metrology OIML http://www.oiml.org/
International Organization for Standardization ISO http://www.iso.org/
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