Is Guangzhong's test result credible?

Credible. According to relevant information, the Institute of Testing and Analysis of Guangdong Academy of Sciences was established in 1972, and its predecessor was Guangdong Central Experimental Station, which was established in 1960. 1985 with the approval of the state science and technology commission and the Guangdong provincial people's government, a national analysis and testing center was established on the basis of the provincial testing and analysis institute. This enterprise is registered and licensed by the Ministry of Industry and Information Technology. It is a legal enterprise with formal and legal business documents, so the test results of Guangzhong are credible.