art_21__para_2__text_1
The supplementary metrology marking shall consist of the capital letter ‘M’ and the last two digits of the year of its affixing, surrounded by a rectangle. The height of the rectangle shall be equal to the height of the CE marking.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.