I'll second orbsvfp's suggestion on the LaMotte test kits. At about $14 per test from the extention lab, I paid for it the first year. Depending on the amount of area you are treating, you might consider using liquid lime. It's a little more pricy but it acts a whole lot faster than granular/powder and it's not as much mess to put down. I use it in my horse paddocks. Also check with the local bulk fertilizer dealer, they will usually apply it if you buy 3-4 tons.