When the CE test standard for a product is not on the list of EU harmonized standards, it is necessary to apply for a CE NB certificate from a specific body. Generally, the CE certification tests for low-risk products involve test standards that are on the list of EU harmonized standards. In this case, the manufacturer can self-declare on the laboratory report with testing capability and affix the CE mark on the product. A CE NB certificate refers to a CE certification certificate issued by a Notified Body (NB) authorized by the EU. In the EU market, certain product groups need to undergo specific conformity assessment procedures, which usually involve testing and certification by a third-party notified body. For certain high-risk categories of products, such as medical devices, personal protective equipment, construction products, etc., EU regulations require conformity assessment by a designated notified body to obtain the CE mark. These notified bodies are independent inspection and certification organizations authorized by the governments of member states and registered with the European Commission and other member states to perform conformity assessment tasks within a designated scope. The NB certificate is issued by these bodies after confirming that the product meets the requirements of the relevant EU directives or regulations, and the certificate will include the identification number of the notified body (i.e., NB number), which must also appear next to the CE mark on the product. In short, a CE NB certificate is a certificate that proves the product has undergone conformity assessment by an EU-designated notified body and complies with relevant EU regulatory requirements.