Test kit Color

I am getting really sick of these test kits and trying to determine the color variations. I always have trouble trying to match the color of the sample with the chart. Does anyone have any tricks? I have tried doubling the sample to get more accurate results but it only helps a little bit. For example measuring nitrates i get a range between 5ppm and 20ppm. I can't tell for sure what is what.

 

Only option is to get the test kits that dont have color for an id, like Salifert. Luna

 

I know what you mean, I consult my kids to ID the color on the charts when Im in doubt......lol Luna

 

hah, i thought i was the only one.

 

I usually dont have problems with mine (API)

 

i also use api.