I used to use a tuning fork at High E, but no matter how much I tried to tune the rest of the strings to that, my G string always sounded off.

I thought maybe something was wrong with the string itself, maybe those bridge adjustments were off, but I didn't want to mess with them.

So I finally spent the money on an electronic tuner, a QuikTune for about $15, and I don't have that problem any more.