Scientific, technical, regulatory, methodological and organizational foundations of metrology, standardization and certification of products and services are outlined. The material is linked to the current regulatory documents: Federal Law of December 27, 2002 No. 184-FZ "On Technical Regulation" and a set of standards GOST R ISO 5725 "Accuracy (accuracy and precision) of measurement methods and results." Characteristics of measuring instruments, principles of technology are disclosed.