The second version of the JBJ digital thermometer called the digitemp 2.
The digi-temp 2 can be used to monitor water temperature fluctuations in any body of water. Great for both saltwater and freshwater temperature monitoring. Comes in a water resistant body with the cable extension seeking place the probe in multiple locations in your aquarium.
Keeping a stable temperature in your aquarium is vital to success in life of your aquatic friends.