How do you read results?

DK314

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Hey everyone!

When performing a water test do you take the test tube and put it up against a white background to read or do you look down the tube? I'm having difficulties reading nitrates. If I put the test tube against a white background the results look close to zero, maybe just a hair darker then yellow. But if I look down the tube it clearly looks like 5 ppm. So which way to read it is correct?
 

SanDiegoRedneck

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DK314 said:
Hey everyone!

When performing a water test do you take the test tube and put it up against a white background to read or do you look down the tube? I'm having difficulties reading nitrates. If I put the test tube against a white background the results look close to zero, maybe just a hair darker then yellow. But if I look down the tube it clearly looks like 5 ppm. So which way to read it is correct?
It can vary slightly due to light angles. Either way nitrates are very low. So that's good.

Are ammonia and nitrite 0?
 

Myboimydudemyfish

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I personally follow the instructions in the kit and put the tube up against a white background in a well lit room at eye level. 0-5ppm does not seem to be much of a difference as it is not a high number, but a water change can’t hurt!
Hopefully more experienced members can give their input as well!
 

UnknownUser

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Put it just a few inches away from the white background on the card and read it in the sunlight. Don’t put it against the white because it’ll look darker. But a word of advice, it’s really hard to distinguish between boxes. If it’s red it’s bad if it’s yellow or orange you are fine! For nitrates anyway.
 

ElysiumPlants

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I always hold it against the white part of the key. As Unknown pointed out, being in adequate light helps.
 
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DK314

DK314

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ElysiumPlants said:
I always hold it against the white part of the key. As Unknown pointed out, being in adequate light helps.
I agree with this 100%. Depending on The time of day it can definitely affect it for sure.
 

StarGirl

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I read it with sunlight by a window against the white background. Or right under a bright light at night time.
 

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