I purchased an HTH test kit today to hold me over and wanted to test the CYA. The instructions say to mix it in the little plastic bottle and then transfer to the "view tube" and look at the black dot. What is the view tube? I don't see a black dot. The kit came with the three "containers" the chlorine/ph test vial, the little plastic one for mixing the CYA and the clear plastic one for the TA and the CH tests. I can't figure out what the CYA view tube is. Stupid I know... sorry, please help?