Accurate salinity measurement with 0.002 gravitational unit precision, safeguarding aquatic pets' health in aquariums, fish ponds, and water containers. Userfriendly operation: Immerse below 15 cm of water for simple, accurate readings. Reduces confusion and errors, suitable for beginners and experienced hobbyists. Sturdy, longlasting construction: Made from quality acrylic for durable performance in daily use and longterm reliability. Versatile compatibility: Works in seawater and freshwater environments across fish containers, aquariums, and ponds, suitable for a range of setups from saltwater tanks to tropical ponds. Use scenarios: 1) Marine aquarium maintenance: Regularly verify salinity to maintain stable reef tank conditions and adjust as needed. 2) Freshwater and pond care: Monitor salinity changes due to evaporation or mineral additions, keeping tropical ponds and fish containers within safe ranges. 3) Quarantine or setup testing: Quick checks before introducing fish or after water changes to ensure safe water parameters.