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Aquarium Systems Instant Ocean Hydrometer
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
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.
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The glass "drop-in" style aquarium More Hydrometer/Thermometer is approximately 8 inches long
Red Sea Hydrometer-Thermometer
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.
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