here a site that has a guitar tuner on it....just incase you can't do it by ear
http://www.8notes.com/guitar_tuner/
it can be quite useful at times....
Az. Reviewed by Az. on . Tuning a guitar while high? Hey Guys. I know some of you get the urge to play your axe while high sometimes and have to tune up before playing. I do this often and am usually very good at determining sharp/flat differences while tuning, when I tune high, the pitches keep changing on me or never quite fit because my mind hears so many different wavy pitches. Anyone ever have this surreal and frustrating (at least 10 minutes) experience? Rating: 5