Types of Metrology
This branch of metrology deals with problems common to all metrological questions irrespective of the quantity measured. It includes general theoretical and practical problems related to units of measurement; the problems of errors in measurement; and the problems of metrological properties of measuring instruments.
Legal metrology relates to mandatory technical requirements. A legal metrology service implements those requirements that would guarantee correct measurements in areas of public interest such as trade, health, the environment, and safety.