The AcuRite Indoor/Outdoor Thermometer with Probe delivers precise, reliable temperature and humidity readings in multiple locations. The main unit displays indoor temperature and humidity where it sits, plus indoor or outdoor temperature measured by its weatherproof and water-resistant wired temperature sensor probe.The bold, easy-to-read LCD screen auto cycles through environment readings. The external temperature sensor probe is 6-feet long for easy positioning outside a window, door or inside a cage, tank or other areas. The display stands upright for tabletop use or is wall-mountable.