The perfect addition to any freshwater or saltwater aquarium, our API test strips are designed to provide accurate and reliable results. These convenient, single-dose strips come in a convenient 25-count box and feature a range of concentrations to suit various water conditions.

With API, you can trust that your fish and plants will thrive thanks to their precise measurements. The strips contain all the necessary ingredients, including potassium nitrate and sodium nitrite, which are essential for maintaining optimal water chemistry.

Our test strips are easy to use: simply add them to a test tube and stir gently until dissolved, then pour into a test container or record your results manually. The API 5-IN-1 Test Strips are perfect for both beginners and experienced aquarists alike, providing hours of peace of mind knowing that their aquarium is receiving the precise balance of nutrients it needs.

With our comprehensive range of concentrations to choose from, you can tailor your test strips to suit your specific needs. And with a reliable formula that's been trusted by aquarium experts since 1950, you can be confident in the results.