Apply the TAYLOR suction cup dial thermometer to any window or non-porous surface to start measuring outdoor temperatures ranging from -40 to 120 deg. With a bold pointer and blue and red dial graphics representing hot and cold temperatures, you'll never leave the house unprepared for the day ahead. Weather-resistant and rustproof, this easy-to-use 3.5 suction cup thermometer ensures the most accurate temperature readings in the cold.