So just finished using tester first time and it’s exactly the same procedure as the ulr phosphate tester except 7 min wait time instead of 3 min for phosphate. It’s very easy and accurate. I used my nyos test kit right after and had same test results so I believe it’s accurate.((FORDTECH)), please give us you're thought's on the Hanna HR.
I'm tired of trying to read shades of pink/purple. I'm using the Tropic Marin nitrate kit.