non-certified property value 

https://doi.org/10.1351/goldbook.08036
Property value that is provided for information only but is not certified by a reference material producer.
Notes:
  1. A non-certified property value cannot be used as reference in a metrological traceability chain.
  2. A non-certified property value may be included in the reference material certificate or supplied in other form.
  3. In ISO Guide 30, "indicative value", "information value", and "informative value" are admitted terms.
Source:
PAC, 2021, 93, 997. 'Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)' on page 1013 (https://doi.org/10.1515/pac-2019-0819)