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    TF-100 CYA control test issues

    Oh, I always thought the idea what to eliminate any sunlight while doing the test hence turning your back to the sun. I guess I will need to buy more R-7065 and R-0013 and try these alternative methods.
  2. S

    TF-100 CYA control test issues

    I was going to create my own thread and then found this one which sums up my issues quite nicely. I hope everyone doesn't mind if I piggyback. I too am having issues with inconsistency even with the standard. Below are some pics with R-7065, which I based on my testing read 25. The pics in order...