According to the provisions in Chapter 5 of the National Economic Industry Classification (GB/T4754-20 17) issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the State Standardization Administration Committee on June 30th,

Refers to the industry that makes technical judgments on products or specific objects by using technical conditions such as instruments, equipment and environmental facilities according to relevant standards or technical specifications. The code is M7452.

Extended data:

The current industry classification and industry category code in China can be inquired through the National Economic Industry Classification (GB/T4754-20 17). By downloading the national economic industry classification standard from the National Bureau of Statistics. After downloading, open the pdf file, so that we can search the industry we need to find in the search bar of the PDF file, and then read its industry code after searching.

National Bureau of Statistics-National Economic Industry Classification