to the digital backup. It takes all the guess work out! I always question if mine is positive. Especially since my IC and FR are not totally darker than the control line. I backed it up w/my digital and got my
Sure enough, that was dark enough to be a positive for me, temp shift confirmed it. If I didn't use the digi, I might have missed it. I love that thing!!
And also
to Katrina that you only have to use 1 or 2 a month b/c they are expensive. I use my IC's until I think I have a positive and then I bust out the big guns to make sure
Good Luck!!