Reading Nitrate - Red Sea Pro

[dragon99]

So I'm having trouble reading between the lines. My test sample comes out much more purple than the card which is pinkish red. Am I trying to match the color or more the shade (darkness) of the sample?

Testing high range so 16x the card's reading. I've been calling it 10ppm (above .5, below .75), but I'm not sure.

I feel like I'm at the optometrist trying to decide if #1 or #2 is clearer and they both look the !@#!@#$ same.

 

[josh.j.avila]

Just split the difference or call it the high end and see where things change. I have the same problem with my NYOS test kits I always enter it on the higher end on the apex testing panel.

 

[Sabellafella]

So I'm having trouble reading between the lines. My test sample comes out much more purple than the card which is pinkish red. Am I trying to match the color or more the shade (darkness) of the sample?

Testing high range so 16x the card's reading. I've been calling it 10ppm (above .5, below .75), but I'm not sure.

I feel like I'm at the optometrist trying to decide if #1 or #2 is clearer and they both look the !@#!@#$ same.

Its more grey so .25