Linear measures regulations apply to any length measurement irrespective of whether the measure is:

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Linear measures regulations govern how length is measured and verified, and they apply regardless of the physical form of the measuring tool. The essential point is that these rules focus on the accuracy and traceability of the length result, not on whether the tool is flexible or rigid.

A flexible measure, like a tape, must be used in a way that controls tension and alignment so the reading reflects the true length, and it is still subject to calibration and acceptable tolerances. An inflexible measure, like a rigid ruler or gauge, must likewise be verified and used correctly to ensure it provides the correct length reading. Because the goal is reliable length measurement in any context, both flexible and inflexible measures fall under these regulations.

So the best answer is that both types are covered; the regulations apply to any length measurement, regardless of whether the measure is flexible or inflexible.