Review on Digital PH Meter With ATC: 4 In 1 PH TDS EC Temp - ORAPXI PH Tester High Accuracy Pocket Size PH Measurement For Pool by Jerry Delic
Calibrated incorrectly
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.
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