I just thought of something... the Pentair kit I am using tells me to add chlorine neutralizer (one or two drops) before I drop in 5 drops of the red stuff. Would the test still be skewed due to high chlorine?

I am also using a Walmart test kit, that test FC and PH. This one doesn't use the chlorine neutralizer. I bought this one because I was testing my FC and PH so much and didn't want to use up the DPD tablets in the Pentair kit.

I do notice I get a slightly different reading when I test the PH with both kits at the same time. I guess it is due to the chlorine.