hydrometers

Coralife Deep Six Hydrometer

The unique design of the Deep Six Hydrometer allows hobbyists to take water samples at six inches in depth without submerging their hands in the water, thus avoiding the possibility of contamination. Samples taken at six inches in...

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Instant Ocean SeaTest Hydrometer

Instant Ocean Hydrometer`s new improved design delivers precise full-range salinity and specific gravity readings - accurate to 0.001 - every time. Easy-fill convenience keeps hands dry when filling. It has a durable, permanent ne...

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Red Sea Hydrometer with Digital Thermometer

Unique intergrated hydrometer and thermometer. Provides accurate measurement of specific gravity (degree of salinity) in a saltwater aquarium. Patented design enables device to be permanently installed inside aquarium, allowing ti...

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AquaticLife Ammonite Hydrometer

Easy-to-read colors and aesthetic appeal! The Ammonite shaped hydrometer from AquaticLife™ integrates a scale for accurate measurement of salinity in a reef or marine aquarium. The yellow needle above the blue background pro...

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Oceanic BioCube Mini Hydrometer

Oceanic BioCube Mini Hydrometer Can remain submerged inside your aquarium or sump; know your salinity in a glance Compact design allows for discreet placement in the aquarium; will not interfere with view Ideal for all saltwate...

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Hagen Living Sea Floating Hydrometer with Thermometer, C & F

Hagen Living Sea Hydrometer with Thermometer—Small 20cm (8") Accurate Easy to read Thermometer—C & F

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Captive Purity Refractometer

The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Rea...

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Marine Depot Aquarium Refractometer

The Refractometer is a must have for all hobbyists. The proper salinity is crucial for the survival and health of your fish and corals. This high quality refractometer is extremely accurate and easy to use and calibrate. Calibrat...

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Vertex RF-1 ATC Aquarium Refractometer

RF-1 Measuring Instruments/ Refractometer Maintaining a stable salinity is one of the most important aspects of reef tank husbandry. Gone are the days when the serious hobbyist relied on Hydrometers to keep tabs on this crucial...

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Hanna Instruments Digital Seawater Refractometer

Designed for Research Grade Analysis HANNA‘s HI 96822 Digital Refractometer is a rugged portable, water resistant device that utilizes the measurement of the refractive index to determine the salinity of natural and artificial ...

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