The K-2006 actually includes TWO chlorine tests: The FAS-DPD drop test we all recommend, and a simpler OTO test that uses a standard Taylor OTO/pH cell. The OTO side only goes to 5ppm for Chlorine but the FAS-DPD test doesn't use the cell at all and measures FC up to 50ppm.

I think that's the source of your very understandable confusion.

We are all going to have to remember that for the future! It's so automatic to all of us we don't even think about it anymore.