A pH tester that failed the high and low test needs calibration. It was only able to calibrate to the high setpoint but still seems close compared to the liquid pH test kit. My only concern is that my PH is in a good range, and for that, shooting between 5 and 7 is great. The TDS meter appears to be working well and both appear to be quality devices. I don't think you can beat them for the price. I would recommend if you are not after more accuracy you might want a larger flow meter but on a budget they are amazing!
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