Originally Posted by: davem_or

That's a good question. You're tuning your guitar relative to itself. Nothing wrong with that as long as you're playing alone. When I first started playing (long time ago) I used an A440 tuning fork. Just looked and saw you can buy them for 5 or 6 dollars. The epitome of being off the grid. No electricity No batteries required.

Yes definetely wrong, by tuning your guitar every time before you play it you develope a kind of perfect pitch to, even if you don't realise it.