That Hanna Nitrate checker is torture, my LFS was showing it to me. I was going to try NYOS and Red Sea next for nitrate. Then again I used Salifert forever and it was never a problem. I really don’t need to know if the nitrate is 5ppm or 10ppm.I was thinking about trying the Hanna tester for Nitrates and Alkalinity since the phosphate tester that I have seems to be pretty accurate, but is a bit tedius. I bought the Red Sea kit to have something a little faster for more frequent testing and really like it. It's easy to do. Alk is what I test daily and I feel like the Salifert test has an area of around .5 where I'm not sure if it is fully pink yet. I'm the same as you with doing the same forever. That one I was thinking to get the Hanna Alk tester but you have me second guessing that. So maybe Red Sea is the was to go for that one too.