Sorry - then I didn't understand what the shot glass method is testing for I'm afraid. Isnt it the same as my little kit just allowing for a higher range of results?

On the instructions for the kit,it says the initial drop test with the OTO drops gives me a free chlorine reading within 10 seconds but only up to 5.0. Then you wait longer and it will give a total chlorine level. Then I assume do the math and get a CC reading.

I thought since the shot glass method allowed me a higher maximum range, if my FC number was 5.0 I would still be able to get a TC number. Is that not right?