The key purpose is to resolve ambiguity: No measurement is perfect. Even with a high‑quality measuring system, there is always uncertainty. ISO 14253‑1 tells industry how to decide “pass” or “fail” while accounting for that uncertainty — thereby reducing false acceptances (consumer risk) and false rejections (producer risk).
If the measured value falls into an indeterminate zone, the standard says unless a different agreement is made (e.g., reduced uncertainty or re‑measurement with a better instrument). INTERNATIONAL STANDARD ISO 14253 1.pdf
This is the most critical takeaway from the standard. The standard assigns the responsibility for the uncertainty: The key purpose is to resolve ambiguity: No
is titled "Geometrical product specifications (GPS) — Inspection by measurement of workpieces and measuring equipment — Part 1: Decision rules for proving conformance or non-conformance with specifications." If the measured value falls into an indeterminate
To reject a product, the measured value must be outside the tolerance limits by more than the measurement uncertainty. Managing Risk: