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Home > Aquarium Supplies > Hydrometers/Refractometers
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Instant Ocean Saltwater Hydrometer
Instant Ocean Saltwater Hydrometer
Starting at: $14.99

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.
Red Sea Refractometer
Red Sea Refractometer
Starting at: $54.99

Red Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25 Deg C/77 Deg F.