The International Organization for Standardization, widely known as ISO, insures that an organization runs its business using international standards. These can include business management, environmental policies, or they can be standards that were developed by the ISO for specific business sectors.
CE certification refers to the requirements made by the European Union (EU) for the products they officially import into the EU nations. Literally it means "Conformité Européenne" or French for "European Conformity." The regulations are designed to protect members of the EU against products that might endanger their safety, pose a pollution hazard to public safety, interfere with electromagnetic devices or create other detrimental effects.
TUV certification involves rigorous testing of the applications for which the component is designed. It includes verification that the device satisfies the strictest European regulations for the industry in which the component was designed for and ensures the component specifications are stated correctly. Periodic retesting of the component is required to maintain TUV approval and the certification is without question the most comprehensive testing any product would undergo. In the case of a tuning module, TUV approval means the product complies with legal exhaust-emissions standards.