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These test strips are designed from the same technology used in medical and science laboratories, giving you fast and accurate results. Tetra Easy Strips are fast, accurate and simple to use. Just dip and read results in 10 seconds. Test for ammonia when setting up a new aquarium or making a water change, when the tap water contains chloramines, if fish breathe rapidly and dart around the tank, or if fish stop eating or have clamped fins. Use the color chart (included) to interpret your test results and determine how best to manage your aquarium's water quality. This product works with the Tetra My Aquarium app for instant water care product recommendations based on testing results.