JW Pet FUSION Standing Aquarium ThermometerJW Pet FUSION Standing Aquarium ThermometerInnovative weighted aquarium thermometer anchors to substrate Anchoring fins keep thermometer upright and facing forward "Green Zone" display healthy aquarium temperature at a glance Drift-free aquarium thermometer eliminates hassle of floating thermometers. Fusion Smart Temp Weighted Aquarium Thermometer is a weighted, drop-in thermometer that stays put facing forward. Unique anchoring fins keep thermometer upright and secure in gravel substrate. "Green Zone" display tells you at a glance if water temperature is within ideal healthy ranges. Aquarium water temperature readout is always visible as the thermometer will not shift positionBe sure to add me to your favorites list!