Blue Marine Refractometer is designed for accurate measurement of salinity in marine aquariums. It provides a clear and easy‑to‑read scale displaying both parts per thousand (ppt) and specific gravity, which are essential parameters for stable reef and marine environments.

The refractometer uses optical measurement technology, offering significantly greater precision than standard hydrometers. Measurement is quick and simple: a few drops of aquarium water are placed on the prism and the value is read through the eyepiece. The instrument is calibrated for a reference temperature of 20 °C, which is standard in marine aquarium keeping.

Its robust metal housing ensures durability and consistent accuracy over time. Supplied in a protective case, the Blue Marine refractometer is ideal for regular use in both hobbyist and advanced reef aquariums.

Technical specifications (EN)

• Product type: Refractometer (optical salinity meter)
• Application: Marine aquarium salinity measurement
• Salinity measurement range: 20–40 ppt
• Specific gravity range: 1.015–1.030
• Measurement method: Optical, manual
• Calibration: Reference temperature 20 °C
• Construction: Durable metal housing
• Reading type: Clear optical scale
• Accessories: Protective storage case included
• Power supply: No batteries required
• Suitable for: Marine and reef aquariums