CYA Test


Active member
Aug 26, 2016
Chapmansboro, Tn
Just a quick question. Following directions, they say to put you back to the sun. When I do this as apposed to facing the sun, I get about 5 points difference. Should I block sun out or I'm I being to silly about it? Thanks Bill


Well-known member
Jul 7, 2014
Hope Mills, NC
We dont do "5s" here. The best way to get results is the 10's method. Start at the 30, then the 40, then the 50 etc. Only look at the tube after filling to a 10, it makes much more consistant results.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
YOur test results are fine. Do not worry about that tiny difference either way.

The precision of the test is plus or minus 10 ppm and some say even plus or minus 15 ppm.
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