you cant see colors?
if you can see colors, then you can use the test kit ok.
you dont have to be exactly exact *S.
there should be a card or something with some colors to match.
you see which color is kind of close to what you have, and then read the numbers next to that color. that will give you a good idea.
HERE IS A GOOD HINT>
I think someone said this befor but,
When you are testing for ammonia , or for nitrite, or for nitrate... the color that you get when you finish adding the drops to the test tube, is the 'zero' reading.
If that color changes at all, that means you have Some. with ammonia and nitrite that is ll you need to know. You want to have zero.
I say, unless you cant see color at al, give it a try, i will beon for a while more and would be interested in how it goes.