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Went to see a band the other night, two guitarists, not a tuner in sight, both out of tune all night (or as long as I was there anyway).
They're not expensive. So why doesn't every guitar player own and use one?
I've just bought a TU-3 for less than £50 and my old TU-2 (which cost £70 about 10 years ago) is still functional if a bit battered.