API Test Kit: which way is correct ? - Aquarium Advice

topgundcp · 01-17-2007, 03:39 PM

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

loyalrogue · 01-17-2007, 04:15 PM

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.

**Devilishturtles** · 01-17-2007, 05:47 PM

Hmm. I hold it directly against the card, but in front of a light too.

01-17-2007, 03:39 PM	#1
topgundcp Aquarium Advice Apprentice Join Date: Mar 2003 Location: California Posts: 17	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

01-17-2007, 04:15 PM	#2
loyalrogue Aquarium Advice Freak Join Date: May 2006 Location: Fort Lauderdale, Florida, USA Posts: 231 Images: 3	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. __________________ "Damsels are the yapping, ankle-biting chihuahuas of the ocean. They have no concept of just how small and annoying they really are."

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