"James" wrote in
:

"Jon Pike" wrote in message
. 159...
Should water tests be read with a light shining through it, and held
up against the white part of the card, or in shadow, held up against
the white
part of the card?

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I don't think it matters much really as long as the same amount goes
through the tester as hits the color gradients. For me, i have always
tested without adding light that would cast any heavy shadows as well
as testing before any changes to the water. :-)

You should give it a try. For me it's the difference between reading a 0
and reading a 2 on my ammonia tester.

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