Marine Depot has the full Lamotte test kit line. They are a little pricey, but very high quality. I've been getting into using colorimeters lately. Much faster than regular test kits. My buddy who works at the water treatment plant turned me on to these. When I get the money, I gotta have one of those!wizord25 said:lamotte is supposed to have some of the best kits, but they only have kits for a few tests - alk, calcium and nitrate i think.