The API FRESHWATER MASTER TEST KIT (Aquaculture Water Quality Test Kit) measures the 4 most important levels in freshwater aquariums quickly and accurately, including pH, high range pH, ammonia, nitrite, and nitrate. 
Testing is fast, easy, and accurate yielding precise results. It comes with 4 glass test tubes with snap-tight caps and a convenient holding tub for easy storage. This FreshWATER MASTER TEST KIT will conduct over 800 tests, so you can get the most out of your kit for years of fast, accurate water testing.