I'm still hesitant to keep the tester just for the ORP reader which is easy to set up and accurate. Once it was possible to calibrate correctly. Then I checked my two aquariums. I first ran a chemistry test on both the liquid and the ProScan strip. The large tank has a PH of 6.5 and this reader returned 7.28. My other tank is also 6.5 and the racer gave me 8.1. I tried to recalibrate but failed 3 times so I gave up on the PH part.
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