I moved your post to its own thread, since your issue was a bit different.
There's no question that the CYA test is the least precise of all -- and that's true of all forms of CYA testing. Strips make the test 'easier' but are horrendously inaccurate, and often can't distinguish water with 10 ppm CYA from water with 60 ppm CYA. The expensive ColorQ Pro photometer is sometimes nearly as accurate as the much less expensive K2006 . . . and sometimes not.
Watch the Taylor videos; they do help:
http://pool9.net/tk-guide/
http://pool9.net/tk-interfere/
A couple of other tips:
+ Do the test outside, holding the CYA test sample at waist level, as you look down.
+ Do the test when the sun is out, BUT with your back to the sun.
+ If you're not sure, have someone else in your family check. Some people have physically perfect vision, but have a harder time than others distinguishing colors and shades.
+ You can re-do the test, by pouring the pool water + CYA reagent BACK into the little squirt bottle, and then doing it again.
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