The Aquadene Aquarium Glass Floating Hydrometer AC-112 is a reliable test kit designed to measure salt levels in all water types. This hydrometer is a must-have tool for maintaining the proper salinity levels in your aquarium to ensure the health and well-being of your fish. Its floating design makes it easy to use and provides accurate readings for a variety of water conditions. Ideal for fresh, brackish, and saltwater tanks, this hydrometer is an essential addition to any fish enthusiast's collection of pet supplies.