@Scott i bought this and seriously changed my experience. i was also on the hunt for runoff ph untill i got this meter . i was finally able to be sure of the soil ph in seconds and as many times i wanted with great results . after that i stopped caring about runoff ph where many times was inaccurate . dont ask me why maybe Chris can explain that better. you will thank me you ll see
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a good soil ph meter would help you a lot . its instant and accurate .