Legal analysis: 1, the social public measurement standard apparatus; 2, departments and enterprises, institutions using the highest measurement standard apparatus; 3, used for trade settlement, safety and security, medical care and health, environmental monitoring included in the mandatory verification directory of the work of measuring instruments.
Legal basis: "People's Republic of China *** and the State Metrology Law" Article IX of the people's governments above the county level measurement of the administrative departments of the public measurement of standard instruments, departments and enterprises, institutions using the highest measurement of standard instruments, as well as used for trade settlement, safety and security, medical and health care, environmental monitoring included in the mandatory verification directory of the work of the measuring instruments, the implementation of mandatory verification. Not in accordance with the provisions of the application for verification or unqualified verification, shall not be used. The implementation of mandatory verification of the work of measuring instruments catalog and management methods, developed by the State Council. The provisions of the preceding paragraph other than the standard measuring instruments and work measuring instruments, the use of units should be regularly calibrated or sent to other measurement and calibration institutions.