I've been using Aqurarium Pharm's NO3 test kit and its okay for general use but I was looking for something a little bit more accurate. I know, just get a LaMotte, but that is a little out of my price range. I came across the kit by Tetra and was wondering if anyone has tried it. Does it seem pretty accurate? What is the resolution on it as far a measuring lower then 10ppm or so? Can't seem to find out any more information on this so that's why I am asking. TIA...