Metrology is a very broad field and can be divided into three subfields.
LEGAL METROLOGY
Concerns the regulatory requirements of measurements and measuring instruments for the protection of health, public safety, the environment, enabling taxation, protection of consumers and fair trade.
APPLIED OR INDUSTRIAL METROLOGY
Concerns the application of measurement science to manufacturing and other processes and their use in society; ensuring the suitability of measurement instruments, their calibration and quality control of measurements.
SCIENTIFIC OR FUNDAMENTAL METROLOGY
Concerns the establishment of measurement units, unit systems, the development of new measurement methods, realization of measurement standards and the transfer of traceability from these standards to users in society.
