"Precise measurements" refers to accurate and detailed calculations or readings that are specific and not approximate. It means being exact and getting the most accurate information possible. Full definition
Equally, without a much more precise measurement of the geometry, it is impossible to determine the nature and evolution of dark energy. (newscientist.com)
By listening in on seismic waves, the instruments will provide ever more precise measurements of the core. (discovermagazine.com)
Mechanical engineering technicians must make precise measurements and keep accurate records for mechanical engineers. (bls.gov)