This handy little tester can test any 20ma LED (any color) without the need for a current limiting resistor. Just snap this tester on a standard 9-volt battery and start testing. 

• Check LED polarity.
• Includes on-board solder pads (with holes) for resistors to experiment with LED brightness changes.
• Accidental reverse connection will not harm the LED.
• Accidental shorting of test clips will not harm the tester.
• Can be used as a simple power source for small lighting projects.
• Soldering your own surface mount LEDs? This tool is a must for checking your work!

Battery not included.