The author notes that the technical grammar of metrology is given in the ISO (International Organization for Standardization) publications ISO 1000 and ISO 31/0. A related document is 'The International System of Units (SI)/Le Systeme International d'Unites (SI)' currently in its fifth (1985) edition. Some of the highlights of 'SI' and some of the common mistakes made by users of these documents are presented.
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