This tester can be used to test light emitting diodes for all kinds of function, brightness, colour & polarity. The LEDs can optionally be tested with the following currents: 1 m A, 2.5 m A, 5 m A, 10 m A, 20 m A & 50 m A. The test contact can accommodate desoldered LEDs with solder residue on their pins as well as br&-new LEDs. 2 test sockets with the same current (10 m A) are arranged side by side for selecting LEDs of the same brightness.