Better CYA test?

Using the 50ppm sample gave me a much better understanding of the test and what Taylor thinks I should see.

Outside, back to the sun, the Taylor sample looks like 40 to me. In my kitchen lighting it looks a little closer to 50 so I just adjust my readings accordingly.

Although, as ajw alludes to, I'm not sure it made a material difference in anything I did the first 6 years of tfp vs the last 3.5 (after being made aware that the 50 sample exists).
 
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