Dumb question about API tests

[saltlife757]

For the nitrate test, are you supposed to match the color by looking through the side of the glass.......... or do you look down from the top?

If I look from the side, it's about 0-5, but if I look down from the top I'm 15-20.

 

[Downbeach]

https://video.search.yahoo.com/sear...970ebe4d5c6d079d52d9df19d16465b8&action=click

 

[saltlife757]

https://video.search.yahoo.com/sear...970ebe4d5c6d079d52d9df19d16465b8&action=click

Haha why couldn't I find this video lol. Thanks for the help