ETL is a US electronic testing laboratory (Electrical Testing Laboratories) for short. The ETL laboratory was founded by American inventor Edison in 1896 and enjoys a high reputation in the United States and around the world. Like UL and CSA, ETL can test and issue ETL certification marks according to UL standards or US national standards, and can also test and issue composite certification marks according to UL standards or US national standards and CSA standards or Canadian standards.