It's heartbreaking to listen to a good player and be thinking the whole time, 'man, TUNE your guitar!' But it happens all the time.

And the studio is even less forgiving. Yes, I know, the ProTools guys can fix it later, but it's just as easy to get it right going in, and they like you better when you do that!

I just picked up a new Peterson tuner at Summer NAMM, and I love it. True bypass, killer accuracy and easy to see on a dark stage floor. And it's in this case that could probably withstand a tour bus parked on it.