On a related note, there's the powerful technique of doing things in a way where the factor(s) that are difficult to measure or control cancel out.

Examples of this is the device[1] used for the redefined kilogram[2], LIGO[3] and many others.

[1]: https://www.nist.gov/si-redefinition/kilogram-kibble-balance

[2]: https://en.wikipedia.org/wiki/2019_redefinition_of_the_SI_ba...

[3]: https://www.ligo.caltech.edu/LA/page/faq (first question)