The Hanna Marine Nitrate HR handheld Colorimeter Reagents, HI-782-25, are specially formulated for use with the Hanna Marine Nitrate High Range Colourimeter. These reagents are essential for accurately measuring nitrate levels in marine aquariums. Each pack contains 25 tests, ensuring a long-lasting supply for regular monitoring. The reagents are pre-measured, making them easy and convenient to use, which helps to maintain the accuracy of the colorimeter readings. Ideal for aquarists who are keen on maintaining optimal water conditions, these reagents are crucial for detecting nitrate levels that could potentially harm marine life. Their reliability and precision make them an indispensable tool for anyone looking to ensure the health and well-being of their marine ecosystem.