what are the best test kits for nitrate?

I just bought one by Aquarium Systems called Fas Test, was $11 at LFS. Previously I had the Aquarium Parmacuticals "all in one kit".... for $19.99 ....complete garbage.
 
I have used many brands of test kits, I am now comfortable using the above stated FasTest for ammonia, nitrate, nitrite, ph and alk. For calcium, phosphates, and all the rest I trust Salifert the most.
 
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