Marineland Precision Submersible Heater, for Freshwater or Saltwater Aquariums, 250-watt

THERMAL SWITCH: Automatically turns off when temperature rises above an internal pre-set and turns back on once it cools down.. ADVANCED HEATING ELEMENT: Contains a mica core surrounded by a mesh heating element for superior heat transfer with enhanced durability.. MOUNTING BRACKET: Securely attaches to glass and provides three window positions to view the temperature display.. EASY TO VIEW: Sliding scale tells the exact temperature setting – top dial view shows the setting from an additional location.. EIGHT SIZES AVAILABLE. This 250 watt heater is for aquariums up to 70 gallons. Adjustable temperature dial allows you to set the temperature 1 degree with every click.. Thermal Switch automatically turns off as temperature rises above an internal preset and turns back on once it cools down.. The advanced heating element contains a mica core surrounded by a mesh heating element for superior heat transfer with enhanced durability. Advanced mounting bracket securely attaches to glass and provides 3 window positions to view the temperature display. Easy to view sliding scale tells the exact temperature setting. Top dial view shows the setting from an additional location.