This innovative clear, flexible, and virtually transparent thermometer adheres firmly to windows or glass doors using electrostatic technology, no mounting hardware necessary. The windowpane thermometer can be easily removed or repositioned wherever you need it. This thermometer is accurate and virtually transparent, the large easy to read numbers can be seen from across the room, great for homes, offices, apartments, RV’s and boats! · Peel off package, press on window · Clings to glass securely · Easy to move and read · All models show both (Fahrenheit & Celsius), however primary scale is larger on each Not sure if you need that extra sweater or cap? Never second-guess outdoor temperature again. Simply peel the static cling from the package and adhere to any clean outdoor window. That’s all you need to set up this EASY-TO READ thermometer. It adheres electrostatically, so you’re free to remove the thermometer any time you need to, whether it’s for window cleaning or you’ve changed your preference about where you’d like to hang it. This thermometer is so versatile, it could go from home to motorhome to boat. Size: 7″ diameter. Fits all standard windows.