Hydrometer

Test your aquarium with more reliability when you use the Instant Ocean® Saltwater Aquarium Salinity Hydrometer.

Accurate, reliable water test equipment is absolutely vital to creating and sustaining a healthy, successful marine environment. Easy to read and simple to operate, the Instant Ocean Hydrometer delivers precise full-range salinity and specific gravity readings -- accurate to ± 0.001 -- and does it each time, every time.

  • Accurate, reliable water test equipment vital for creating and sustaining a healthy, successful marine environment
  • Easy to read and simple to operate
  • Delivers precise, full-range salinity and specific gravity readings – accurate to +/- 0.001 – every time you measure

Accurate to ± 0.001.