They do the measurements, make the marks on a piece of paper that have, by convention, been agreed to stand for the measurements, and some other group can then use those measurements to make other measures, and so forth. They have best practices to minimize the effect of errors entering the system, sure, but none of this has anything to do with “belief.”
You seem to have a picture of science that consists of data-gathering. Once you bring in theories, you then have a situation where there a multuple theories, and some groups of scientists are exploring theory A rather than B..and that might as well be called belief.
You seem to have a picture of science that consists of data-gathering. Once you bring in theories, you then have a situation where there a multuple theories, and some groups of scientists are exploring theory A rather than B..and that might as well be called belief.