The S mark is a Japanese product safety mark. Japan's DENTORL Law, Electrical Devices, and Materials Control Law stipulates that 498 products must pass safety certification before entering the Japanese market. Among them, 165 types of Class A products should obtain T-MARK certification, and 333 types of Class B products should obtain S-MARK certification. TUV Rheinland is one of the first S-MARK certification agencies recognized after the DENTORL law was announced.