The first column of numbers under Cl are for chlorine. The second column of numbers under Br are for bromine. This applies to the left/yellow side. Ph readings on the right/pink side.
So if you are matching the 4 that is for bromine and 2 is your chlorine reading.
That was an old pic for reference. My pH currently is 7.3 or so. Is the Cl accurate enough to plug into pool math or do I need to do the power test that's in the TF-100 on a daily basis to maintain my Cl?
I use the block 2 or 3 times a week to verify that there IS chlorine, and that the yellow is dark enough to be near the 5 level, and that the pH isn't getting too high.
The TF 100 gets used about once a week now that I have everything pretty much dialed in and stable.
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