Which Nitrate Test Kit do you use?

I just got a salifert kit over the weekend and I have a nutrafin nitrate kit too, the salifert kit gave a small reading of <2ppm very faint reading while the nutrafin gave me 0 or a very faint light blue, they are kind of hard to look but I guess I have low nitrate which is good.
 
I've tested Salifert and Fast Test readings against my colorimeter and the Salifert was almost dead on with all I tested. Fast Test was pretty good with Ammonia; Phosphate gives a good indication of whether there are some or not, but isn't totally accurate as to the actual reading. I didn't have the reagent for nitrite or nitrate, but copper was WAY off on the Fast Test and close but not dead on with the copper. HTH, Marcye
 
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