API Freshwater Master Test Kit Nitrate Colors Are Wrong

If you’ve purchased the API Freshwater Master Test Kit, you have probably noticed that the colors for 10 ppm and 20 ppm on the nitrate test are pretty much the same. I think it must have been a misprint on the multi-test color card.. When my nitrate test solutions ran out, I purchased the individual nitrate test kit. It includes it’s own color card and the 10/20 difference is quite distinct. Then 10 ppm color is more yellow, the 20 ppm color much more red. The other colors are also different, with 5 ppm being more yellow and 160 ppm being very brown.

I couldn’t get a great shot of the two cards, but hopefully this is good enough to keep you from pulling out your hair. If you have hair.