Silverline Indoor/Outdoor Stick-On Thermometer Clear Plastic Square Thermometer Colour-Coded Dial & Easy-To-Read Celsius Temperature Scale For Indoor & Outdoor Use Attaches With 4 Self-Adhesive Pads To Windows So Outdoor Temperature Can Be Read From Indoors & Vice Versa Ideal For The Home, Conservatory Or Greenhouse Size: 75 x 75 x 25mm Temperature Reading: -50° To 50°C