2.

The MPE, positive or negative in mm, between two non-consecutive scale marks is (a + bL), where: L is the value of the length rounded up to the next whole metre; and a and b are given in Table 1 below. When a terminal interval is bounded by a surface, the MPE for any distance beginning at this point is increased by the value c given in Table 1. Table 1 Applies to the tape/dip weight combinations. If the nominal tape length exceeds 30 m, an additional mpe of 0,75 mm shall be permitted for each 30 m of tape length. Accuracy Class a (mm) b c (mm) I 0,1 0,1 0,1 II 0,3 0,2 0,2 III 0,6 0,4 0,3 D — special class for dipping tapes Up to and including 30 m 1,5 zero zero S — special class for tank strapping tapes For each 30 m length when the tape is supported on a flat surface 1,5 zero zero Dip tapes may also be of Classes I or II in which case for any length between two scale marks, one of which is on the sinker and the other on the tape, the MPE is ± 0,6 mm when application of the formula gives a value of less than 0,6 mm. The MPE for the length between consecutive scale marks, and the maximum permissible difference between two consecutive intervals, are given in Table 2 below. Table 2 Length i of the interval MPE or difference in millimetres according to accuracy class I II III i ≤ 1 mm 0,1 0,2 0,3 1 mm < i ≤ 1 cm 0,2 0,4 0,6 Where a rule is of the folding type, the jointing shall be such as not to cause any errors, supplementary to those above, exceeding: 0,3 mm for Class II, and 0,5 mm for Class III.

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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.