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Living Sea Hydrometer
|Hagen Living Sea Hydrometer. Proper salt content is vital to the health and well being of captive marine species. Use the Hagen Aquarium Hydrometer to determine the actual specific gravity of marine water aquariums on an ongoing basis. 8" (20 cm) Accurate Easy to read Thermometer - C & F Ensure all replacement water has the same salinity as the aquarium.|