I'm hoping for some clarification on pH testing using the Taylor K-1000 kit that came with my TF-100 kit. I know this question is going to be hard to explain but here is the question: am I trying to match the color or the intensity of the color? It looks like the top 3 blocks on the tester are nearly the same color but with different intensities. (Like three different samples of the same berry Kool-Aid but at different dilution levels). The 7.5 does appear to have a hint of orange and the other two are definitely more orange. It seems to me that the color of my test water never seems to fall exactly in the spectrum from pink to orange with the same intensities on the tester and the spectrum seems to end at the 7.8 block with the 8.2 block being a darker version of 7.8 and not necessarily less orange.
I acknowledge that I may be expecting more precision than such a simple test kit can provide, but I'm an engineer by nature (and degree) and a career pilot. Attention to detail and precision are in my DNA.