Review on Versatile RCYAGO pH Meter with Ph Electrode: Accurate pH Tester for Various Applications - Water, Milk, Cheese, Soil, Food by William Groupp
Junk, pH changes 0.5 units with each calibration
The pH meter needs to be recalibrated EVERY time it is used and will vary by 0.5 units. This is unacceptable as it means the instrument has a significant variation in performance and accuracy. Even immediately after the recalibration, I wouldn't trust the results.
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