This tester can be used to test light emitting diodes for all kinds of function brightness colour and polarity the leds can optionally be tested with the following currents 1 ma 25 ma 5 ma 10 ma 20 ma and 50 ma the test contact can accommodate desoldered leds with solder residue on their pins as well as brand new leds 2 test sockets with the same current 10 ma are arranged side by side for selecting leds of the same brightness