If you want to know the pH of your soil, I'd suggest just sending a sample of your soil to your state soil testing lab. Here in Texas that'd be A&M in College Station. They'll tell you the pH and everything else you'd want to know.
For fertility usually good compost is all you need, but if you don't want to or can't do that then there are fertilizers out there that are made specifically for tomatoes. But really with good compost and adequate water you should do fine.
You might enjoy this article:
http://garden.org/ideas/view/d...
