What does the abbreviation PEI mean and what are the tasks of the PEI with regard to the self-tests?

The abbreviation PEI stands for the Paul Ehrlich Institute. Together with the Robert Koch Institute, the PEI has drawn up a list of minimum criteria that antigen rapid tests must meet according to the manufacturer's specifications. If a test fulfils all criteria according to the manufacturer's information, it is listed by the BfArM. This list only includes antigen tests that have been reported to the BfArM by the manufacturer or distributor. The Paul Ehrlich Institute also conducts comparative experimental studies on the sensitivity of the antigen rapid tests.

Source: https://www.pei.de/DE/newsroom/dossier/coronavirus/coronavirus-inhalt.html;jsessionid=09B536A7388CE2341E5768C21C36E201.intranet231?nn=169730&cms_pos=3