acceptance interval 

Synonym: acceptance zone
https://doi.org/10.1351/goldbook.08052
Interval of permissible measured quantity values.
Notes:
  1. Unless otherwise stated in the specification, the acceptance limits belong to the acceptance interval.
  2. An acceptance interval is termed an "acceptance zone" in the Eurachem guide on compliance assessment.
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1019 [Terms] [Paper]