Review on High Accuracy Digital Water Tester Pen – pH Meter with 0-14 pH Measurement Range for Drinking Water, Plants, and Swimming Pools - Yellow by Lexi Mastandrea
Garbage. That does not work.
Doesn't work at all. I even took it to a gardening shop to have it calibrated even though they said it was already calibrated. In Solution 4.0 it was 2.0. In Solution 7.0, the pen reads Solution 6.8. It also states that some sort of powder solution is used for the calibration, but it doesn't come with any of the powders listed. And the battery died after I spent an hour calibrating this thing. Just spend another $20 and get one that really works. Revain refunded my money. Many Thanks
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