Features: 1PROFESSIONAL MEASUREMENT: This ammonia nitrogen test reagent is a kind of reagent for professional measurement of ammonia nitrogen content in water, suitable for sea water and fresh water. 2FREE NITROGEN: The main harmful effect of ammonia nitrogen on aquatic organisms is free nitrogen. Its toxicity is dozens of times greater than that of ammonium salts, and it increases with the increase of alkalinity, so it needs timely detection and treatment. 3PH VALUE: Ammonia toxicity is closely related to the pH value and water temperature of the water quality. In general, the higher the pH value and water temperature, the stronger the toxicity, and the harm to fish is similar to nitrite. 4EASY TO USE: It is easy to use, according to the measurement steps on the back of the box, add reagents one by one, you can see the color change, and then refer to the ammonia nitrogen color chart to get it. 5NITROGEN FERTILIZER: Sodium nitrate and calcium nitrate are good nitrogen fertilizers. If plants are deficient in nitrogen, their leaves will turn yellow, but excessive amounts can easily grow algae. Item Type: Aquarium Ammonia Nitrogen Detection Agent Material: Test Agent Purpose: Ammonia Nitrogen Detection in Fish Tank Package Included: 3 x Test Agent 1 x Test Bottle 1 x Colorimetric Card