That's a good way to tune your ears, too. For G you can use an electric tuner and just memorize the slight dissonance between G and B. I do highly recommend ge

That's a good way to tune your ears, too. For G you can use an electric tuner and just memorize the slight dissonance between G and B. I do highly recommend getting a clip-on electronic tuner, because if you want to change tunings quickly or you want to do drop D on a floating bridge, you are gonna need it!