Headwind 8400006 Dial Suction Cup Thermometer, 3.5-Inch E-Z Read Dial Thermometer 3.5in This rugged, indoor/outdoor thermometer is a perfect unit for the consumer with minimal window space and/or wants to keep their window view maximized This thermometer reads Celsius and Fahrenheit and comes with a suction cup attached, for easy mounting Compact at only 3 Dial suction cup thermometer Bold marking to allow for easy reading Easy to mount Temperature range is from -60 degree fahrenheit to 120 degree fahrenheit Thermometer measures 3-1/2-inch diameter