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How are you coming along with your pH pen problem? What exactly is the problem you are experiencing? Are they dead, erratic readings, not calibrating. I'd like to help. Let me know.
hey, they were cheaper testers ,i cleaned them regularly but didnt know about calibration or storing solutions. i have ph paper and up and down kit using the drops in ur runoff. im growing all organic and perlite.. thanks for ur help
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