Metrology is a broad field and may be divided into three basic activities:
– Definition of internationally accepted units of measurement.
– Realisation of these units of measurement in practice.
– Application of chains of traceability linking measurements made in practice to reference standards.
Metrology also has three basic subfields, all of which make use of the three basic activities, though in varying proportions:
– Scientific or fundamental metrology
– Applied, industrial or technical metrology
– Legal metrology