Fast Easy Accurate Nitrite is produced in the aquarium by fish waste and uneaten fish food. Low levels of nitrite inhibit respiration and suppress the immune system; high levels cause suffocation and fish death This kit contains: liquid dropper bottle with child-resistant safety cap, easy-to-read instructions with information on how to test and how to correct unsafe water conditions, color chart and glass test tube with snap-tight cap. Item / Quantity 00026. API Pond Nitrite Test Kit 180 Test (MPN 26) / 180