Practical device for testing LEDs (2-150mA) ,. Just plug your LED into the appropriate holes (which are all marked) and press the button to see its brightness, color of light, etc. The top row is for 2-pin LEDs with currents ranging from 2 mA to 30 mA, The bottom row is for 4-pin LEDs (piranha LED) with currents ranging from 20 mA to 150 mA Powered by a 9V battery (not included), Element size (L * W * H): Approx. 8 x 5.5 x 2.2 cm / 3.15 "x 2.16" x 0.87 "
