Liquid-measuring devices are used in many different commercial applications. The vast array of liquid products that are measured includes some products that may pose difficulties in testing. NIST Handbook 44 allows for substitution of fluids during testing in place of the actual fluids that will be used in commerce to mitigate some of these issues. The most important consideration that will determine if one fluid can be used as a viable substitute for another is whether the results of the testing with the alternative fluid will accurately predict the performance of the device when measuring the fluid with which the device will normally be used. This article provides some guidance and considerations to help those who need to make decisions about whether or not to allow substitute fluids for testing.
The Proper Use of Substitute Test Fluids, Other, National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908682
(Accessed December 6, 2023)