These high-range student safety thermometers are designed for classroom use. They are -free, along with having a recessed glass tube in a molded plastic case for safe classroom use. Each thermometer features dual-scale temperature readings from -40°F to 120°F and -40 degree centigrade to 50 degree centigrade. Set contains 4 pieces of thermometers. Features - Color: As Shown. - Material: Plastic. - Size: 40.00X6.00X1.00cm/15.72X2.36X0.39inch. - It's lightweight and small enough to take practically anywhere! - Our accurate thermometer reads down to a chilly -40° Fahrenheit or -40° Celsius. - There’s a mounting hole on back of the thermometer, you are able to use the screw to it up on the wall or use the suction cups to attach it to your window, to helps you to keep the temperature at a desirable level. - And please the thermometer in direct sunlight, mount it in the shade will help you to get an accurate reading. - The thermometer is not electronic, there’s not batteries to run dead, both saved money and the for you. Package list: 4 x thermometers