This little tester can test any 20ma LED (any color) without the need for a current limiting resistor. Just snap the test on a standard 9-volt battery and start testing. Accidental reverse connection will not harm LED. Accidental shorting of test clips will not harm tester. Includes on-board solder pads (with holes) for resistors to experiment with LED brightness changes. Can also be used as a simple power source for small lighting projects.


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