Much like the lights you put on the tree during the holidays, one bad LED can spoil the bunch. To prevent this kind of scenario, it’s important to test, test, and test again. That’s where this handy LED and diode testing tool comes in.
It provides a constant test current and reads out the diode forward voltage. This allows you to identify LED polarity and brightness at various current levels. Since most other instruments lack these features, it’s helpful to have a tool like this one on hand.
Other quality of life features include a large and easily read display, Arduino compatibility, and a lighted power switch with automatic shutoff. The entire product is also open-source, right down to the hardware itself.