Since the questions up what test kits does anyone use that they think works better because all the ones I bought give so many different readings that i'm not sure any more .I hear good things about ones and then find it does not work well or is hard to read or figure out .I would love one that really works or is that asking to much .They can send a man to space but they can't make a good quality water test kit for ponds .I have taken mine a couple of times to a local pet store here that will test the water for you .Free if you buy from them 3 dollars if not ,but then it takes a half hour to get there ,but it is nice they give you a whole read out of your water .You leave and come back in 2 hours and it's ready sometimes ,that also depends on how many they have to do .