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Aquarium Hydrometers
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Aquarium Systems Instant Ocean Hydrometer
Aquarium Systems Instant Ocean Hydrometer
In Stock
Our Price: $7.99
In Stock

The Instant Ocean Hydrometer delivers precise full-range salinity and specific gravity readings--accurate to 0.001. Easy to read display and simple to operate.
Coralife Deep Six Hydrometer
Coralife Deep Six Hydrometer
In Stock
Our Price: $8.50
In Stock

From Coralife. Range is 1.000 to 1.032.

Every unit is calibrated and tested for accuracy using advanced testing procedures.

With its durable construction and easy-to-read scales, the Deep Six is guaranteed to provide years of reliable performance. Designed to give temperature-corrected readings in warm water aquariums, readings can be read in ppt and specific gravity. The Deep Six is accurate to +/- 0.001 specific gravity.
More Hydrometer
More Hydrometer/Thermometer
Out of Stock
Our Price: $4.69
(Out of Stock)

The glass "drop-in" style aquarium More Hydrometer/Thermometer is approximately 8 inches long
Red Sea Saltwater Aquarium Hydrometer and Digital Thermometer
Red Sea Hydrometer-Thermometer
In Stock
Our Price: $13.99
In Stock

Red Sea Hydrometer-Thermometer is a saltwater aquarium hydrometer with digital thermometer for continuous (when submerged) or periodic reading of specific gravity in saltwater aquariums
  • Unit is calibrated for use at 25 deg C (77 deg F)
  • Hydrometer : floating needle type with readable scale from 1.010 to 1.030 in 0.001 graduations
  • All swing-arm plastic hydrometers for aquarium use are only accurate when used within the normal range of operating temperatures for marine aquariums (approx 25 deg C / 77 deg F). A digital thermometer to ensure that the water being tested is at the correct temperature.