# Council Directive of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (80/181/EEC), Article 1

Extent: E+W+S+N.I.

The legal units of measurement within the meaning of this Directive which must be used for expressing quantities shall be:
(a) those listed in Chapter I of the Annex;
(b) those listed in Chapter II of the Annex only in those Member States where they were authorised on 21 April 1973 ;
(c) those listed in Chapter III of the Annex only in those Member States where they were authorized on 21 April 1973 and until a date to be fixed by those States. This date may not be later than 31 December 1994;
(d) those listed in Chapter IV of the Annex only in those Member States where they were authorized on 21 April 1973 and until a date to be fixed by those States. This date may not be later than 31 December 1999.

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Source: https://www.legislation.gov.uk/eudr/1980/181/article/1 (the official version)
Page: https://openlegislation.uk/eu-directive-1980-181/article-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.