Hagen Living Sea Hydrometer-Thermometer C and F, Large, 12-Inch
The Living Sea Hydrometer with Thermometer is important to maintain proper living conditions for your fish. The use of the hydrometer is important to check specific gravity of aquarium water and to ensure all replacement water has the same salinity as your aquarium. Maintaining proper water temperature with the thermometer will help to ensure your fish are comfortable in their aquarium.