Your marine friends need safe， toxin-free water to grow and thrive in， so make sure their home is safe with Salifert Aquarium Nitrite Test Kit. Fintastic for measuring the levels of nitrite in your aquarium’s water， this test kit can accurately and immediately perform checks up to sixty times， meaning you can rest easy knowing your pals are swimming in safe water for a long time to come. Since excess nitrites can hurt your fishy friends， it is essential to test for this compound to keep your aquarium safe. These tests change color to detect even minor fluctuations within minutes so you can find them early on for vital intervention as needed so your fish， plants， and other marine friends can swim about happily and healthily.