This document specifies the most important design and metrological characteristics of two-point inside micrometers:

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with a scale interval or digital step of 0,001 mm and 0,01 mm;

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with analogue or digital indication.

This document is applicable to two-point inside micrometers with and without interchangeable extensions.

This document does not apply to micrometers fitted with a dial gauge, or to jaw micrometers.