nh3 test kit

[Mike1989]

Does anyone know of a test kit that only measures ammonia(nh3) and not ammonium(nh4). Used amquel+ and reading small amount of ammonia/ammonium but I was also reading that it turns ammonia into ammonium which will give you a false reading on api mater kit

 

[Gti_Leo]

we test for ammonium in our tanks, when ammonia i added to water the hydronium that bond multipule water ions are added to the neutral ammonia to make ammonium and become a water ion and ammonium ion which is mildly acidic, which reduces PH and the reason why when you cycle your tank you get some unstable PH readings