I don't mean to hijack your thread into a discussion on test kits, but I got the Pinpoint NO3 monitor and thought I would mention the results I got. As I mentioned, I've been testing with a Salifert kit, but tend to "cheat" by hovering the sample over the colour chart, rather than setting it right on the paper. My "hover" readings I figured to be 10ppm for both my tanks, but figured if I did the test correctly, my NO3 is probably more like 25. Well, to my surprise, my Reef tank tested at 10 and my FOWLR tested at 12ppm with the Pinpoint. Needless to say, I'm very happy about this
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Anyway,...that's all. Back to you.