You could buy the soil test kit for 18.00 at gander mountain which contains a piece of pH paper and directions how to use it. Just joking. Tplay if you carry some deionized(distilled) water with you and mix some with the dirt in a bowl or cup you should get accurate results. Hill if you buy some pH paper which would be much cheaper and do what I told Tplay to do and that will give you what you are looking for. There probably is a county agriculture agent in your area that would be a wealth of info.

good luck

Rich