Sweet Baby Jesus, this thing is WAY bigger than I thought it was going to be. It's also the most instantaneous and accurate soil meter I've ever seen. I had no idea a soil meter could be this fucking fantastically fabulous! I give it five stars out of four. If you're serious about soil growing at all I HIGHLY advise you get one of these babies. Most internet sites are out of stock as they use the same distributor, make sure to send the site an e-mail first to check and see if they have them. I had to go through three companies and the third one listed them as in stock when they were not, so they special ordered it and air shipped it across the country for free.
I'm super stoked I got this thing, I thought I had used enough lime/oyster shell in my soil mix but it's riding at about 5.2. Whoops, glad I caught that early!
Also, my roots organics potting soil is reading at 6.5 right out of the bag. Way to go, Roots!