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Size:6-pack Attach this compact device to the side of your aquarium and terrarium for accurate temperature readings to ±1.5°F. Temperature probe sits inside aquarium to monitor temperature, while LCD provides °C or °F readings from -10°F to 140°F. Includes power button, mounting suction cups, 39" temperature probe, and replaceable battery. 2-1/4" x 1-1/2".