Glass hydrometer for aquariums: compact, portable design for use anywhere in your aquarium. It measures the specific gravity of seawater to indicate salinity and guide adjustments. Densitometer for aquariums: helps aquarists determine the specific gravity of saltwater and adjust water quality accordingly to maintain stable conditions. Water meter: this hydrometer is made from solid glass material for durability and reliable performance as a water salimeter. Seawater quality tester: an aquarium hydrometer for aquarists who want to maintain salinity, serving as a saltwater gravimeter for routine monitoring. Key benefits - Quick, straightforward measurement of salinity to support healthy aquatic life. - Portable and space saving, easy to use in any tank setup. - Durable solid glass construction for long service life. - Suitable for saltwater aquariums and aquaculture applications. Use scenarios - Before a water change: verify the salinity of your mixed saltwater to ensure it matches your tank requirements. - New setup: check the specific gravity of prepared saltwater before introducing livestock to the tank. - On the go or in quarantine tanks: monitor salinity during transport, acclimation, or temporary setups to maintain stable conditions.