Ammonia question

[blue steel]

I just purchased an ammonia test kit from my lfs, but sometimes they are not too bright, and I got a freshwater test kit. Can I use this kit to test my ammonia levels, or do i need to get one strictly for saltwater? Also would the numbers(results) be the same?:help:

 

[cindyski]

myanswer would be no, unless it is a test kit that will work for both, in which case there would be 2 color cards, one for salt and one for fresh

 

[cprdnick]

Now wait a minute. Isn't a common practice with our saltwater kits to test our top off in the event of suspicion? Why couldn't it work the other way around???:notsure:
Read the directions and see if it says for FW only.