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API® 5-IN-1 TEST STRIPS are the quick and easy way to test the 5 most important aquarium water parameters – pH, KH, GH, nitrate, and nitrite – ...

API® 5-IN-1 TEST STRIPS are the quick and easy way to test the 5 most important aquarium water parameters – pH, KH, GH, nitrate, and nitrit...

API® 5-IN-1 TEST STRIPS are the quick and easy way to test the 5 most important aquarium water parameters – pH, KH, GH, nitrate, and nitrit...

Salicylate test measures ammonia levels in both fresh & saltwater aquariums. Ammonia, the #1 killer of tropical fish, is continually prod...

Tests tap water & fresh or saltwater aquariums for carbonate hardness (KH). Helps prevent fish stress caused by rapid pH shifts, the resu...

The API® COPPER TEST KIT allows you to easily and accurately monitor copper levels to maintain copper-based fish treatments at therapeutic le...

Tests tap water & freshwater aquariums for general hardness (GH) and carbonate hardness (KH).Helps prevent fish stress caused by rapid pH...

Use to measure pH changes in marine aquariums, aquariums with African chchlids, and very alkaline tap water. Reads the pH of water within the...

Effective for both fresh & saltwater aquariums. High levels of nitrate are a food source for unwanted algae & indicate poor water qua...

Tests for nitrite in freshwater & saltwater aquariums. Nitrite, toxic to fish, is produced by nitrifying bacteria in the biological filte...

Enables user to adjust pH levels as required & includes 1.25 oz bottles of pH Up, pH Down, and pH Indicator Solution. Tests the pH of wat...

The API® pH TEST KIT monitors pH to maintain healthy freshwater conditions in your tank. pH control is imperative to prevent the harmful eff...

Phosphate can enter your aquarium through tap water, fish waste, and decaying organics such as uneaten food and dead algae. Excess phosphate ...

The API® POND MASTER TEST KIT measures the most important levels in your pond quickly and accurately, including pH, ammonia, nitrite, and phosphate...

Calcium is one of the most important elements in a reef aquarium. Reef invertebrates, such as corals, crustaceans, mollusks, and even some type of ...

The API® REEF MASTER TEST KIT test 4 key parameters – calcium, carbonate hardness, phosphate, and nitrate – to keep reef inhabitants healthy...