Review on ๐ ORAPXI Digital PH Tester for Water - Accurate PH Meter for Household Drinking Water, Hydroponics, Lab & Aquarium with 0.01pH Resolution and ATC by Susan Alexander
Incorrect calibration
Received last November, unused until January 2nd, thought something was wrong due to the amount of caustic required to raise the pH. In the past, our water was always too high. I tried recalibrating to find that when I put the tester in a pH 9.18 solution, it calibrated at pH 6.86 instead of 9.18. I tried everything, changed batteries and solutions, nothing helped.
- GOLS certified
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