The readings are slightly different from the Blue Labs pH pen, so it's hard to tell which one is correct. They're usually pretty close to where it doesn't really matter. The sticky suction cup that holds the pH probe to the side of the tank never gets stuck. Also note that the dosing pump is on a time cycle and will NOT dose based on your pH. 4 stars because it shows my pH 90% of the time and the other 10% I just go to the troubleshooting guide and do what it says. This fixed it every time.
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