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Secondly, the accuracy of that particular test (the kh/pH relationship) has been shown to be quite variable depending on the presence of any other acids in your tank. Many folks have thought they had much higher or lower amounts of CO2 than what was in actuality due to these errors.
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This doesn't matter one bit. The indicator is disolved in DI/RO/Nanopure water. The GH and KH is zero. Since the color change is purely a gas phase equilibrium, what you see is what you get. Bromothymol blue is blue at pH 7.6 and yellow at pH 6.