OK so put the cup on top of the color bar. Then squint your eyes, look to the left and stand on one foot.
Seriously though, this test is a bee-hatch to read. Drives me nuts every time.
I find it "easiest" to read if I start at the darkest part of the color bar and work my way to the lighter end. Most of the time I find my eyes trick me and I can see the color through it no matter what.
I have heard reports that the FM test kit is easier but I haven't tried it.
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Christy's Reef Blog
My 180 Build
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