The abbreviation of China Metrology Certification "CMA" is the English abbreviation of China Inspection Body and Laboratory Mandatory Approval (China Metrology Certification/Accreditation). According to the provisions of the Measurement Law of the People's Republic of China, the measurement administrative department of the people's government at or above the provincial level conducts a comprehensive certification and evaluation of the testing capabilities and reliability of the testing institution. This kind of certification targets all product quality supervision and inspection agencies and other types of laboratories that issue fair data to the society; such as various product quality supervision and inspection stations, environmental testing stations, centers for disease prevention and control, etc.
Testing institutions that have obtained metrological certification certificates are allowed to use the CMA mark on their inspection reports; inspection reports with the CMA mark can be used for product quality evaluation, results and judicial appraisal, and have legal effect.
The country is currently promoting systems such as compulsory metrological certification, review accreditation and "laboratory accreditation" in which laboratories voluntarily participate, to ensure the fairness, scientificity and authoritativeness of testing institutions in providing services to society. These certifications are based on the national It is based on laws such as the Measurement Law, the Standardization Law and the Quality Law.
This job is a highly technical law enforcement oversight job. All testing institutions that have passed the metrology certification of the national metrology administration department will be awarded the CMA metrology certification mark by the state. This mark can be stamped on the upper left corner of the test report.

1. CMA is the abbreviation of China Inspection Body and Laboratory Mandatory Approval (literal translation: China Inspection Body and Laboratory Mandatory Approval). Testing institutions that have obtained laboratory qualification accreditation (measurement certification) certificates can use the CMA mark on inspection (testing, testing) certificates and reports according to the items approved and listed on the certificate.
2. In 2001, the country promulgated the "Measurement Certification/Inspection and Accreditation (Acceptance) Evaluation Guidelines (Trial)", which was implemented on December 1 of the same year and the original evaluation guideline JJG1021-90 was abolished. The evaluation system followed by metrological certification: "Laboratory Qualification Accreditation Review Guidelines", which also supplements the provisions of China's metrological legal management.
3. Laboratory qualification accreditation (measurement certification) is implemented at two levels. One is at the national level, organized and implemented by the National Certification and Accreditation Administration Commission; the other is at the provincial level, organized and implemented by the Provincial Quality and Technical Supervision Bureau, and the specific work is undertaken by the Metrology and Certification Office (Measurement Office). Whether it is national or provincial level, the effectiveness of implementation is completely the same. Whether it is national or provincial certification, the testing agencies that have passed the certification are equally legally valid across the country. There is no difference in effectiveness between different handling departments.
4. According to the regulations on metrological certification management, data issued by testing institutions that have passed metrological certification and used for trade certification, product quality evaluation, and result identification have legal validity as notarized data. It is illegal for technical institutions without metrological certification to provide notarized data to the society, and any violation will be prosecuted.
5. China’s testing institutions that have passed metrological certification have covered agriculture, fishery, forestry, machinery, post and telecommunications, chemical industry, light industry, electrical engineering, metallurgy, geology, transportation, urban construction and environmental protection, safety protection, water conservancy and other industries and departments, and have started A relatively complete range of testing categories.

1. Laboratory qualification accreditation (measurement certification) is one of the important tasks of legal metrology management. For testing institutions, it is a mandatory approval system for testing institutions to enter the testing service market. That is, only institutions with metrological certification qualifications and legal status of metrological certification can provide testing services to the society.
2. National laboratory accreditation is consistent with the foreign laboratory accreditation system and is a voluntary capability accreditation activity. Through the laboratory's nationally recognized testing technology institution, it is proven that it meets the internationally accepted requirements for the availability of calibration and/or testing laboratory capabilities.

The certification of testing institutions is strictly carried out in accordance with provincial or national metrology certification work procedures. It can be roughly divided into the following main steps:
1. Submit metrology certification application materials (including quality manual, procedure documents, etc.) to the provincial or national metrology certification office;
2. The provincial or national metrology certification office will conduct a written review of the application materials;
3. After passing the written review and in accordance with the evaluation criteria of metrology certification, the provincial or national metrology certification office will arrange to entrust a technical review team to conduct on-site verification review;
4. Testing institutions that pass on-site review and meet the requirements of the standards will be issued a metrology certification certificate and a metrology certification agency seal by the provincial or national Quality and Technical Supervision Bureau, and publish them on the Internet.