Tried to calibrate this thing and it was always off. I followed the instructions and it was just everywhere. Luckily I bought a Hanna Ph tester. I tested Hanner Checker 3xs and the readings were the same. At the same time, he never stopped at a number, not even for a split second. It jumps and wobbles far from the correct display. How much time and money I have in my reef tank, I wouldn't trust this thing AT ALL!
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