tolerance interval 

Synonym: specification zone
https://doi.org/10.1351/goldbook.08135
Interval of permissible quantity values.
Notes:
  1. Unless otherwise stated in a specified requirement, the tolerance limits belong to the tolerance interval.
  2. The term "tolerance interval" as used in conformity assessment has a different meaning from the same term as it is used in statistics.
  3. A permissible quantity value of a specified quantity is required of an item fulfilling a specified requirement.
  4. Permissible quantity values must not be confused with permissible measured quantity value of an acceptance interval.
See also: conformity assessment
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1042 [Terms] [Paper]
Citation: 'tolerance interval' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08135 RIS BibTex EndNote
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