If you're looking for an edgier way to tune your axe—one that uses your sense of sight rather than that of sound—look no further than the Stimmmopped, a device that uses LEDs to keep your licks sounding sweet.
The Stimmmopped, which might be more fun to say than it is to use, bombards your guitar's strings, one at a time, with two LEDs. The lights flash at the exact frequency at which the string should be vibrating, so if it's tuned too flat or too sharp the LEDs will appear to move. When the string's tuned correctly, the lights will look like they're perfectly still.
This is, of course, how all the rowdiest rock stars keep their guitars tuned just right. [Make]