JW Pet Fusion Smart Temp Weighted Aquarium Thermometer White One Size

The Standing Thermometer has uniquely designed anchoring fins to keep the thermometer facing forward no spinning! The weighted base keeps it in place on the bottom of the tank, simply push into the gravel. The Standing Thermometer also offers a Green Safe Zone which indicates the optimal temperature range and a High-End Accuracy- (+/-) 1.5 ?F.