Since I work primarily in the ...

Published February 9, 2022 22:45 by Arnold Liu, CEO & Scientific Director at Quantum Dynamics, Inc.

Since I work primarily in the aerospace flow metrology industry, where we typically try to measure with +/- 0.1% uncertainties or better, I was not aware of the details of the Parshall flume. Ian Pearson's comment spurred me to take a closer look at the theoretical background of said device as a +/- 2% "instrument". Take a look at the Wikipedia article on Parshall flumes and at the ASTM and ISO standards listed therein. Good reading, if +/- 2% is all that you need.