Originally Posted by: natashagranger

Thank you very much everyone. Great help! I will use all these tips and hopefully over time I will know if the guitar is in tune (or close enough) by ear.

And I forgot the best tip for ear recognition; sing the note when the guitar is in tune. Literally shen you're tuned up, strike the low E and then try to sing the same note while the guitar note rings out. You know (strike string) and sing: "EEEEEEEEEEEEEEEEEEEEEEE"

It's a very small version of what singers ear training does.