i have an API Master Test Kit that included test for Ammonia, PH high & low, Nitrites, and Nitrates.
i was getting low on the Nitrate tests, and recently bought a API individual Nitrate Test.
here is a picture of the packaging of each...
each product contained the exact same looking bottles used for the tests. the thing that i find odd is that the two color charts are noticeably different. here is a pic of those...
the one on the left is from the Master Test Kit, and the one on the right is from the Nitrate Test kit.
i accidentally cut the numbers off on the right color chart, but they read the same.
why are the colors so different, and which one would you experts consider the correct one?
overall, i'm not a big fan of API's testing. i find the PH test results are hard to differentiate the colors.
and also, on these two Nitrate color charts in my pic, i can't even tell the difference in some of them. particulary, on the Master Test Kit chart, can anyone tell the difference between the 10 or the 20ppm colors. and on the individual Nitrate test, 40 and 80 look identical to me. maybe my eyesight is bad when it comes to that, i don't know.