Free Online Guitar Tuner
I use a small korg guitar tuner that's great buy when I am out and about I can use this mini online guitar tuner
to help out. Just click on the string and the tone will play. Hope it helps.
Playing out of tune is one of the cardinal mistakes I hear all the time. I can only assume that the guitar
players cannot hear that they are out of tune or they do not care.
I strongly recommend checking yout tuning often. The pros do and so should you.