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Instant Ocean-Aquarium Systems Presents Instant Ocean-Aquarium Systems (Io) Instant Ocean Hydrometer. Instant Ocean Hydrometer Accurate, Reliable Water Test Equipment is Absolutely Vital to ... Read More
Red Sea Fish Pharm Presents Red Sea Hydrometer with Therm Digital Thermometer. The Unique, Patented Design of Red Sea's Hydrometer Enables it to be Installed Inside the Aquarium or Sump. Giving a ... Read More
![Red Sea Fish Pharm Presents Red Sea Hydrometer with Therm Digital Thermometer. The Unique, Patented Design of Red Sea's Hydrometer Enables it to be Installed Inside the Aquarium or Sump. Giving a Continuous "Real Time" Reading of Specific Gravity. In Addition it can be Used as a Typical Hydrometer for Periodic Measurements. Includes a Digital Thermometer to Insure Tested Water is at Correct Temperature. [34790]](http://cdn.petcarerx.com/img/PrdImg/408x408/22465_001_xl.jpg)