Exactly what we needed for to test our water treatment and our drinking water with the filter. Very easy to use just add a few drops and swirl and color appears instantly. Thank you for the fast shipping too.
Jamie, you ;and Vitev have never failed me. I appreciated the PH drops so I'm able to monitor my water from my filter and I, now, am able to see when I might need a new filter before the six-month date. So far, so good. Keep up the good work!! Deonia
Love the product!