spa fun

I'm switching from Bullfrog Ease to Dichlor/Bleach. In the description, the author says to get CYA from between 20 to 30. My Taylor pool kit only tests to 30. Is there a kit available that can test CYA to 20? For Free Chlorine, my test kit goes to 5. My understanding is depending on the load in the tub, at times you'll want to have a FC of 7 prior to heavy use. With my current set up, I can't read anything above 5. Is there a kit or a separate tester than reads beyond 5? Thank you for your help