Are they worth it? Sure...why not?
I decided to try one of these out. I bought the one at ACE Hardware for $21.99, sure glad I am given to impulse, cause I could have saved $7.00 less shipping buying on the web. I.D.o.I.t.
So, Mr. Lollipop grabbed it and was so excited to test for phosphorus and potash you'd thought I was given a lead role in Rocky 8. I would have played the guy pushing the wheelchair back and forth as Rocky's fists of arthritis bruised some shill's kneecaps. Adrian would have been there at the ready with his defib device...
So, like Rocky I took a swing at the soil, knowing, if I did not test it and need to buy $150 worth of soil amendment swamp waste that Madonna uses, I was not "really" doing the right thing for the garden. Argh!
I bought the Rapidtest Kit (seen below) and well, it was so chemistry-looking and technical, I simply could not pass it up. The moment I saw it though, I KNEW, I was going to buy it and get results I could have predicted, yet, still had to spend the money. Cause! what if my soil was deficient. I would be terrified. In this economic climate why add another worry?
I get it home, quickly test for nitrogen and viola' - perfect!. I test for phosphorus and viola' - perfecto. I test for potash and viola' - perfecto!!! I threw the pH test away. My soil has proven to me over and over, that I could drop a meatloaf in the ground and out would pop a meatloaf tree. Yummmmmmmmmmmmmm, meeeeeaaaaaatlooooooaf treeeeee!
Have a ketchup tree next to it and when it was windy the perfect union of trees if there ever was one. Oh wait, and a well of beer too.
Conclusion - if you have land that used to be a Jiffy Lube, test your soil. If you look around and see a lot of nothing, growing in your area, I bet your soil needs help and your local nursery can tell you what to add. Otherwise, I am sure it is just fine. Buy a couple bags of Miracle Grow soil amendment, it will make you feel better and your younger plants might just like it - regardless.