Precision Calibrated - Shatterproof Aquarium Heaters.

Features:

• Electonic thermostat with advance gravity shutoff technology - When the heater top tilts below the heater bottom, the heater will automatically shut off.
• Shatterproof and nearly indestructible - Made with thermal plastic covered metal core for added strength and even heat distribution.
• Adjustable temperature setting with +/- 1d F accuracy.
• LED heating indicator illuminates red when actively heating

• Fully Submersible: Can be placed vertically or horizontally in the aquarium and the large temperature control knob makes modifying the temperature easy.
• For freshwater or marine aquariums up to 20 gallons.
• Lifetime limited warranty.