Thermor Bios Indoor/Outdoor Digital Suction Cup Thermometer (White, 4.25-Inch x 5.7-Inch x 0.9-Inch) Digital Suction Cup Thermometer measures and displays temperatures and can be placed on interior or exterior of any window. Jumbo LCD readout display shows current temperature with the most recent min and max temperatures. Unique "see through" display Weatherproof F/C switchable