1.3C certification
The full name of 3C certification is "Compulsory Product Certification System", with English name China Compulsory Certification and English abbreviation CCC. It is a product conformity assessment system implemented by China government in accordance with laws and regulations to protect consumers' personal safety and national security, strengthen product quality management.

3C logo is usually stuck on the product surface or pressed on the product by molding. If you look closely, you will find a number of oval "CCC" symbols. There is a random code behind each 3C logo, and each random code has a corresponding manufacturer and product. When issuing the compulsory product certification mark, the certification mark issuing management center has entered the product corresponding to the code into the computer database, and consumers can inquire about the code through the National Quality Certification Center.

It should be noted that the 3C mark is not a quality mark, but only the most basic safety certification. In other words, this is a national mandatory certification, without which it is not allowed to go on sale.

Second, the explosion-proof certification
Explosion-proof certification is used to determine whether the gas detector meets the requirements of explosion-proof standards, type test and adaptive routine test. If it meets the requirements, the corresponding explosion-proof certification certificate will be issued. When applying for an explosion-proof certificate, the gas detector needs to provide a lot of important information, such as enterprise information certificate, enterprise quality guarantee, technical data, samples submitted for application for explosion-proof certificate, etc., so we should pay attention to check whether there is an explosion-proof certificate when choosing a gas detector.

Three, manufacturing measuring instruments license and explosion-proof electrical equipment installation and repair qualification certificate