Accurately measure nitrite levels in your freshwater aquarium with the reliable API Nitrite Test Kit. Nitrites are a byproduct of the nitrogen cycle and can be toxic to fish. This easy-to-use test kit allows you to quickly and accurately determine nitrite levels in your water, enabling you to take corrective action promptly Key Features: Simple and Accurate: The liquid titration method provides precise nitrite readings.   Easy to Use: Clear instructions and color charts make testing a breeze. Essential for Aquarium Health: Monitor nitrite levels to ensure a safe and healthy environment for your fish. Quick Results: Get accurate readings in minutes.   How it Works: Collect water sample: Draw a sample of aquarium water. Add reagents: Add the included reagents to the water sample. Compare colors: Compare the color of the water sample to the provided color chart. Determine nitrite level: Read the nitrite level directly from the chart. Maintain optimal water quality and ensure the well-being of your aquatic inhabitants with the API Nitrite Test Kit.