Dont waste your time grap some soil samples mix em up and send a cup of dirt to a lab there are many I use the one through the mossy oak bio logic site it's easy pain free and you get the results pretty fast through the email. I started out with a ph meter and could not get any consistent test results with it using a lab is the way to go. If you tell them what you are growing they will also recommened how much lime and what type of fert. to use.