FC
CC
pH
TA
CH
CYA
Make sure you do the CYA test outside, in bright sunlight, back to the sun, reading the vial at about waist height in your shadow. I will fill the vial to 90, then glance for the dot, if I see it, I fill to 80, glance for the dot. I repeat until I can not see the dot at a glance. Don't stare for it, your eyes will play tricks and you'll think you see it.
Remember, you can pour the sample back into the mixing tube, shake, and repeat the test a few more times if needed. The important part is that you give the sample enough time to develop, I will shake for 15 sec, let it sit for 30-45 sec, shake again for 15 then go to it.