With this test module, light-emitting diodes of all types can be tested for function, brightness, colour and polarity. The LEDs can be tested with the following currents: 1 mA, 2.5 mA, 5 mA, 10 mA, 20 mA and 50 mA. Brand-new LEDs as well as desoldered LEDs with solder residues on the connection legs can be plugged into the test contacts. To select LEDs for equal brightness, 2 test sockets with equal currents (10 mA) are arranged next to each other.