EPA universal certification allows the recipient to work on virtually all appliances that contain refrigerants, small and large, high-pressure and low-pressure. The universal certification requires the possession of Type I, II and III certificates for handling A/C and other refrigerants.
The required examination for EPA universal certification covers safety, regulations, shipping of refrigerants and identification of different refrigerants and their effect on the environment and the ozone layer. Test takers are able to take the examination on their personal computers; their results are later posted online. The EPA offers free resources such as study guides and practice tests to potential test takers.