Put the cup on the white section of the test card, and look
down under normal daylight lighting. What you see through
the cup with the white underneath should be compared to one
of the squares filled with color.

Marc


Skipp wrote:

When reading salifert Phosphate are you supposed to look down through the
top,and keep the test tube on the edge of the color chip so that you see
both the white area and the color chip,Then move the test tube down the row
of colors until you can not a see color chart color.To me the first color
that you can not see would be equal to the color in the test tube.
Thanks Skipp



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