I just got this set up a few hours ago. What a great little device it is. The instructions and drops that came with is were garbage but the checker is great. I made a 4dkh solution and then add API PH drops to it until the color was dark enough to read. I decided to evaporate my own water in order to ensure there were absolutely no other buffers (Phosphates, ect) besides carbonates in the solution. 2ml water and 2 drop API PH.
The solution started a nice dark blue (PH 7.6) and within 2 hours turned the telltale color of light green showing a nice 30+ppm of Co2 or a PH of 6.6ish. This little device will monitor my PH constantly for months before a new solution is needed.
I love it! fantastic!
No more PH testing for me!
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