What is the best way to do the CYA test. I have a K 2006 and usually hold the tube at waist level. Where should the sunlight be for the most acurate result. I think I saw a thread about this somewhere but I can't find it.
Also, try to test at around the same time of day each time you test. Small variations in the amount of available light can make a huge difference in what numbers you will get.
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