I'm using a tetra test kit for ammonia and nitrites. The Nitrites I can always measure without an issue but the ammonia test results are another story. The two lowest colors on the test kit don't really match the vial... I can't really tell if it's darker or lighter than either of the colors...can anyone recomend a kit for ammonia that is easy to read?
Try looking down into the tube to match the color. See if that helps any.
I have the Aquarium Pharmaceuticals master kit. It is usually easy to tell the difference in the colors....but sometimes they run together. I just put the tube up beside the color chart and see which one is closer. If its too close, I hold the tube over the color to see which one is closest.