This device is extremely inaccurate. It doesn't calibrate properly as the numbers go up and down like a roller coaster as the sensor is in the 6.86 test standard. I thought I calibrated it and made a pH adjustment of the solution based on the reading. After checking with another known "good" pH meter, I had to drain several gallons of hydroponic medium. Don't trust this gauge any more than you can give up and right now I want it.
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