"Precise quantification" means accurately measuring or determining the exact amount or quantity of something. It refers to being very specific and detailed in terms of how much of something is being measured or described. Full definition
We present a new isobaric labelling reagent for quantitative mass spectrometry that allows more precise quantification in complex samples. (carellgroup.de)
Emissions from cookstoves and farms defy precise quantification. (discovermagazine.com)
Rather, these disparities indicate a dialectal difference between Aboriginal English and Standard English, as well as a common unfamiliarity with and lack of competence in handling precise quantification amongst Aboriginal people.28 (humanrights.gov.au)