I was a little skeptic if it would actually work.
I have done laboratory testing on my two different properties in the past.
And the testing seem to line up pretty accurately.
Even testing bottle water.
I have had the unit for 6 months now I've been very happy with its information I had an issue shortly after purchased but the product was replaced immediately very happy with the after sales
Kactoily 7-in-1 Pool Pro Water Monitor- pH, Free Chlorine