Review on Rechargeable Digital Water pH Meter with ATC - High Precision 0.01pH Resolution Tester for Hydroponics, Aquarium, and Lab - Measurement Range 0~14 pH by Lawrence Allison
Not calibrated correctly
Received last November, unused until January 2nd, thought something was wrong due to the amount of caustic needed to raise the pH. In the past, our water was always too high. When attempting to recalibrate, it was found that when the tester was placed in a pH 9.18 solution, it calibrated to pH 6.86, not 9.18. I tried everything, changed batteries and solutions, nothing helped.
- Expensive
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