The Clear Plastic Salinity Hydrometer is an essential tool for any marine aquarium enthusiast. It accurately measures specific gravity (1.000-1.030 SG) and salinity (0-40 ppt), allowing you to maintain the perfect environment for your warm water fish tanks between 18-28°C. This swing-out pointer provides an easy-to-read display, making it simple to monitor and adjust water parameters. Its sturdy construction and sleek design ensure longevity and convenience. With its precision and reliability, this salinity hydrometer is a must-have for every marine aquarium setup.