Key Features Genuine Oase Aquarium accessory Easy to read large display Can be bonded onto the aquarium wall from the outside Monitor the temperature levels in your tank. Includes Battery Oase Digital Aquarium Thermometer is a highly accurate temperature monitoring display for use in your tank. The thermometer can be bonded onto the side of the aquarium to make reading the display easy. The thermometer has a large front display that shows the temperature clear and bold.