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Old 08-15-2006, 12:48 AM   #1
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Trouble reading Nitrate tester

I have the API nitrate tester. My problem is, if I hold the test tube vertically up against the card, it looks yellow (0ppm nitrate). If I hold it horizontally, it looks a little orange (5ppm). And if I take off the cap and look straight down, it's even more (10ppm).

What's the right way to read it?
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Old 08-15-2006, 12:53 AM   #2
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As long as it is like the API kits I know and love, just hold it over the blank white area of the card in a well lit room.
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Old 08-15-2006, 02:12 PM   #3
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That's exactly what I'm doing. But what's the proper orientation to hold the tube against the white card? I get three different readings depending on which way the tube is oriented against the white background.
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Old 08-15-2006, 02:17 PM   #4
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try up and down.
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Old 08-15-2006, 02:21 PM   #5
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I've always held it with the length of the card. The only other test I've ever seen done differently is copper.
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