- Lightweight and compact hydrometer tool for easy portability and use as a hydrometer test device - Glass hydrometer with a simple design that is easy to operate, requiring no professional knowledge - Accurate measurement of liquid specific gravity to reveal concentration and purity - Salinometer built from reliable glass material, practical and not easy to break - Use scenarios: - Home brewing or wine making to monitor sugar concentration and density during fermentation - Aquarium or hydroponics setups to measure salinity or liquid density - Educational science experiments or basic kitchen testing to compare densities of different liquids - Key attributes: - Function: measures liquid specific gravity for concentration and purity - Material: glass construction for durability and reliability - Size: compact and portable for convenient on-the-go use - Performance: simple-to-use design with stable readings