SW test kits

[danj]

I have two different SW test kits and i get very different readings on the nitrates.
Aqur Pharm INC = 20
Aqur Sys Fast test = 10
What is the best test kit to use that is accurate?

 

[zenn]

INC...the fast test ones are fairly inaccurate from what i've read.

 

[morgan24]

i use fast test with no problems