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Pond Care Nitrate NO3 Test Kit (Liquid) contains: Two dropper bottles for dispensing of test solutions, Easy-to-read instructions and color chart, Non-staining glass test tube with snap-tight cap. Nitrate build-up is often an indicator of declining water quality. High levels of nitrate are frequently associated with poor fish health, algae growth, and a build-up of organic pollutants. This kit measures nitrate (NO3) in freshwater and saltwater. Contains 90 Tests