Review on 💧 Highly Accurate Portable Water Tester: Optimizing Water Quality Assessments by Gary Haymon

I have calibrated this device very carefully according to the instructions, but it gives very unstable readings on every test sample. No matter what I do, the readings just go up as I watch. I mean a lot. A known sample with a pH of about 7.0 starts at about 7.2 and goes above 8.5 I observe. The same also applies if the supplied calibration samples are checked again. It's not expensive, but it's still a waste of money. Don't bother either.