Hagen Hydrometer - Thermometer - 12 in.

Simple, yet effective salinity and temperature readings are possible with the Hydrometer Plus. This handy 12 in. device floats directly on the surface of your aquarium to easily detect salt rates and monitor temperature with its built-in thermometer!

Proper salt content is vital to the health and well being of captive marine species. Use the Hagen Aquarium Hydrometer to determine actual specific gravity of marine water aquariums on an ongoing basis. Ensure all replacement water has the same salinity as the aquarium. _____________________________________________________________________________________