Throw that thing away. When I first started growing i used one of those and thought everything was hunky-dory. Then all sorts of shit happened. What was the kicker for me was that I would stick that piece of shit in all different soils and it would read the same. Half my plants were locked up.
They sell ones that look the same but read moisture-those work pretty well.
Invest in a 50 dollar digital pen, get some 4 and 7 ph calibration solution and never look back.
growbe Reviewed by growbe on . Anyone ever use one of these before? I bought this PH/Fertility tester today and it seems to be pretty accurate. I have tested with my normal methods of testing which is one of those water, soil, or what ever you are testing shakers. And I get around the same reading as I do with the new electronic meter. The fertility check also seems to work. It reads how much P-N-K is in the soil and gives you a reading. not enough, ideal, or to high. I was feeding one plant water only. Tested it and it said to little. I added the Rating: 5