I had a different one, or they changed it. But we can figure this our regardless. In the end, you want 50% CYA mix, and the other 50% is equal parts pool water and tap water.
So 50 % cya reagent / 25% pool/ 25% tap.
The result gets multiplied by 2.
The key to this test is a super quick glance. If you stare more than a fraction of a second, the brain will see the dot. Want to see your brain lie to you ? Look at your nose. It's been there this whole time. All week even.

. So super fast glance and you see it instantly, or not.