# Material measure of length — Accuracy classes and maximum permissible errors for trade measuring instruments (EU MID)

For Material measure of length, annex is X; accuracy class is I, II, III, D, S; condition is Between two non-consecutive scale marks; maximum permissible error is Formula (a + bL) mm; class-dependent a and b values; scope or member state option is MI-008. Length measure MPE formula, recorded from its source on 2026-08-05.

- **Instrument type:** Material measure of length
- **Annex:** X
- **Accuracy class:** I, II, III, D, S
- **Condition:** Between two non-consecutive scale marks _(our reading, not quoted from the source)_
- **Maximum permissible error:** Formula (a + bL) mm; class-dependent a and b values
- **Scope or member state option:** MI-008. Length measure MPE formula. _(our reading, not quoted from the source)_

## What the source says

> The MPE, positive or negative in mm, between two non-consecutive scale marks is (a + bL), where:

## Source

- https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32014L0032

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [Accuracy classes and maximum permissible errors for trade measuring instruments (EU MID)](https://referencesource.org/legal-metrology-accuracy-classes/).