Blue Marine Hydrometer is a classic and easy‑to‑use tool for measuring salinity in marine aquariums. It provides direct readings of water salinity in parts per thousand (ppt) as well as specific gravity, both essential parameters for maintaining stable reef and marine environments.

The hydrometer is simple to operate: it is filled with aquarium water and the floating indicator provides an immediate reading. The clear scale allows quick and easy interpretation of results, making it suitable for beginners and experienced aquarists alike. As a fully mechanical device, it requires no batteries, calibration or electronic components.

The Blue Marine Hydrometer is ideal for regular monitoring of salinity during water changes, topping‑up, or when preparing new saltwater for aquarium use.

Technical specifications (EN)

• Product type: Hydrometer (salinity meter)
• Application: Marine aquarium salinity measurement
• Salinity measurement range: 22–36 ppt
• Specific gravity range: 1.016–1.028
• Reading method: Mechanical, direct reading
• Power supply: No batteries required
• Calibration: No calibration required
• Construction: Lightweight and durable plastic housing
• Suitable for: Marine and reef aquariums