I am not sure that is a wise thing to do. The test kit does work but it is rather vague
trying to determine .5 ppm of cupramine for example using the color card. It was bad
enough with the color card let alone a picture of a card posted on the internet and
then printed out.
In the end I just bought another copper test kit, seachem's, to help me stay in the
area I needed. I used them both.
In the end.. i am not pleased at all with the current state of copper test kits. period.
Granted I only used two but they all seem the same. Salifert only goes up to .4 ppm and
red sea was just as vague.
my two cents.