Features: 1.Plastic Material: The aquarium hydrometer is made from plastic, ensuring durability and resistance to damage. Its compact and waterproof design makes it a practical and long lasting tool for measuring water parameters. 2.Accurate Measurements: The hydrometer provides precise measurement results, allowing you to monitor the salinity and specific gravity levels of your aquarium with confidence. It ensures accurate readings, supporting optimal water conditions for your water pets. 3.Clear Safety Zones: The hydrometer features clear indicators for safety zones, including salinity and specific gravity scales. The outer scale represents salinity (PPT), while the inner scale represents specific gravity. 4.Versatile Usage: Designed for use in saltwater, freshwater, and marine aquariums, the hydrometer is a versatile tool for testing salinity and specific gravity levels. It provides both dissolving and specific gravity scales, catering to the needs of different types of aquariums. 5.Easy to Read Design: The hydrometer features a transparent design, allowing for easy reading of the measurement results. The rocking arm pointer and stable base ensure stability during readings, providing easy experience for aquarium owners. Specification: Item Type: Aquarium Hydrometer_x000D_ Material: Plastic_x000D_ Usage: Fish Tank, Aquarium_x000D_ Size: Approx. 12 x 8.5 x 1.6cm / 4.7 x 3.3 x 0.6in_x000D_ Testing Stick Length: Approx. 13.5cm / 5.3in PackageList: 1 x Aquarium Hydrometer 1 x Testing Stick