With the aid of this test module it is made possible to carry out tests with all kinds of light emitting diodes in order to check function, brightness, colour and polarity. The LED's could be tested optionally with following currents: ca. 1 mA, 2,5 mA, 5 mA, 10 mA, 20 mA and 50 mA. It is feasible to insert into the test contacts brand-new LED's as well as soldered out LED's with residual soldering tin at the connecting pins. In order to facilitate selection of LED's of equal brightness, there have been placed two test sockets with the same currents (10mA) side by side. Necessary: battery 9 V/DC.