Petzlifeworld Hydrometer Floating Salt Hydrometer For Fish Tank Aquarium Thermometer

The glass hydrometer can be used for measuring seawater specific gravity and water temperature Single Size: Length 21cm(8.27in) Easy to use: Just place it in the aquarium, and it will floating in the water, you can easily read the measurement Material: Made of glass material, high quality and durable Application: The brine hydrometer is perfect for fish aquarium, helping to provide a desire environment for your fishes.