wrmiller
Aquarium Advice Freak
OK. What is the appropriate way to read this darn thing? If I hold it a little out from the card and don't lay it right against the card (Image 1) I am getting that I am at about 20ppm Nitrates. If I lay the test tube against the card it looks like it is at about 40-80ppm. What is the appropriate way to read these darn things? I have seen folks display theirs in post before and usually they have them standing up which to me says that most people must hold them out from the card a little at minimum?