The Strobe-e Keychain Tuner is a guitar tuner, bottle opener, and flashlight - all in one. The LED of the Strobe-e flashes at the same frequency as your low E string when it is in tune. Just shine the Strobe-e on your Low E - if the string appears to be moving adjust the tension of the string until it appears to be still. When the string appears to be still, it's in tune.
Strobe-e Keychain Tuner
