"James" wrote in
:

OK, here's what I did to kinda see where you were coming from. I added
light as you said and that washes out my sample in the tube. MY method
(ymmv) is to hold the tube 1/2'' away and yet parallel to the card,
this gives accurate reading for me every time.

That's all I got :-) Good Luck

I'll give it a shot, thanks

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