The API Test Kit Nitrite FW is a reliable and accurate water testing solution designed specifically for freshwater aquariums. This nitrite test kit helps you monitor toxic nitrite (NO2) levels that can harm or kill your fish if left unchecked. Nitrite testing is especially critical during the nitrogen cycle when setting up a new aquarium, as well as for ongoing maintenance to ensure a healthy aquatic environment. The kit features an easy-to-use liquid drop test with a color comparison chart that provides fast, accurate results. Each kit contains enough test solution for multiple tests, making it an economical choice for regular water quality monitoring. Tests nitrite (NO2) levels in freshwater aquariums Easy liquid drop test with color chart Fast and accurate results Essential for new tank cycling Helps prevent nitrite poisoning Multiple tests per kit Monitors water quality and fish health Includes test solution and detailed instructions Additional Features Product Gross Weight: 0.1500 lb Product Net Weight: 0.1500 lb Product Height: 5.13 in Product Length: 2.38 in Product Width: 1.50 in