I bought one a while back from the Bass Pro Shop for like 14 bucks on sale. I was a little skeptical about using it but I went ahead and tried it out on a new place I bought this year, the reading said the ph was good so I just added some fertilizer to the Imperial Extreme on a small half acre test patch I came back the next week and it had already started budding out all over the only problem I face is that I do not have water on this property so I have to rely on mother nature. I use that sucker now to test the ph in my garden at home heck I even checked the ph of my yard. I think it is pretty accurate the key is to make sure that the ground is a little damp when you stick the probe in it.