1. Accuracy Classes
Instruments are divided into primary categories designated by: X or Y as specified by the manufacturer. These primary categories are further divided into four accuracy classes: XI, XII, XIII & XIIII and Y(I), Y(II), Y(a) & Y(b) which shall be specified by the manufacturer.
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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.