The classification of measurement can be divided into three categories from a macro perspective: scientific measurement, engineering measurement, and legal measurement.

1. Scientific measurement

Scientific measurement refers to basic, exploratory, and prioritized measurement science research. The latest scientific and technological achievements are often used to accurately define and implement units of measurement and provide a reliable measurement basis for the latest technological developments. Scientific measurement is usually the main task of measurement science research institutions, especially the national measurement science research institutions, including the research of measurement units and unit systems, the development of measurement standards and standards, the study of physical constants and precision measurement techniques, and the traceability and quantity of quantities. Research on value transfer systems, methods of magnitude comparison and measurement uncertainty.

2, engineering measurement

Engineering measurement is also called industrial measurement, which refers to the application measurement in various engineering and industrial enterprises. For example, energy or material consumption, process monitoring, and product quality and performance testing. As the technical content of products increases and the complexity increases, the fields involved in engineering measurement become more and more extensive. The consistency and interchangeability necessary to ensure the globalization of economic sweaters. Engineering measurement has become an indispensable part of production process control.

3. Legal measurement

Legal measurement is to ensure public safety, national economic and social development, according to the needs of the legal system, technology and administrative management, the government or its authorized institutions to conduct mandatory management, including measurement units, measuring instruments (especially measurement standards, standards) ), measurement methods and statutory requirements of the measurement laboratory.

From the point of view of actual work, legal measurement is mainly related to security protection. Benefits such as health care, environmental monitoring and trade settlement or mandatory measurement in areas of special trust. For example, the measurement of measuring instruments such as scales, pressure gauges, electricity meters, water meters, gas meters, sphygmomanometers, and the like.