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Old 01-17-2007, 02:39 PM   #1
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API Test Kit: which way is correct ?

When testing for Nitrate, the instruction says that The tube should be viewed
against the white area beside the color chart. If I put the tube on the white area touching the card, The color is close to read 20ppm, but if I leave a little space between the tube and the card, it would read 10ppm. Which way is correct ? please advise. Thanks

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Old 01-17-2007, 03:15 PM   #2
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Good question.

I found that when I held it against the card it seemed that the glass tube was creating a shadow that made the results look darker.
Now I just hold it up in front of a well-lit wall.

FWIW, I've never bothered to ask what the proper way is so I could be doing it wrong.

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Old 01-17-2007, 04:47 PM   #3
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Hmm. I hold it directly against the card, but in front of a light too.

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