I dissagree with team2jndd. With amonia you can have a slightly less accurate test (such as the AP ones that kfowler mentioned. I also use their amonia test and like it). But i say amonia doesnt have to be as precise because in a cycled tank, you should not be having amonia at all. I test for amonia waay less than i test for nitrates and phosphates, calcium, etc. Amonia and nitrite, once the tank is cycled, does not move unless something big dies.