
The product is fairly accurate as far as I can tell (tested with Bluelabs ph pen). much better than the cheap yellow counters. read quickly in 0.01 units. easy calibration. ⚠⚠UPDATE⚠⚠ After using this meter for more than three months, I noticed that it does NOT take long to calibrate. After two uses after calibration, it is very faded (see second photo). the solution is 6.86 and the numerator shows 7.1. Last time I used it I measured, cycled the unit and tested the water again and the readings were mixed. If you use this meter, I recommend calibrating it before EVERY use. I thought it was a step up from cheap "yellow" counters. I was wrong? I gave two stars anyway because it's pretty accurate when it comes out of the box. The accuracy of this meter is questionable considering that when I check the pH twice, the reading isn't the same as the first time I checked it. even after calibration. At the moment I calibrate before every use. I'm not sure how others calculate accuracy, but I can hardly say it's accurate.

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