to be honest, i dont think there is. It will probably be hard to tell with any test kit untill they invent a digital one that tells you accurately what the params are!
Blubble
The Salifert ammonia test kit makes the API look like the junk it is. Salifert comes with 2 syringes, a large test container that has 4 flat sides on the bottom for easy viewing, only uses 1 bottle of reagent, results in 3 minutes and the card colors range from white to a burnt orange, no yellow to green confusion.Is there a better test kit for amonia than the API master? I always find it hard to tell between yellow and green 0 or 0.25.
untill they invent a digital one that tells you accurately what the params are!