Dretec Thermometer Digital Wall Mount Indoor/Outdoor O-285IV (Ivory)

The external and internal temperatures can be viewed on one screen. The maximum and minimum temperatures can be recorded and checked by pressing the "Max/Min" button. The external sensor at the end of the cord is waterproof, making it also suitable for measuring the temperature of the aquarium. It comes with a hook hole, magnet, and stand, making it easy to use anywhere. The 3m long cord is designed to not break even if it is clamped between a window or a refrigerator.