TFA indoor thermometer and hygrometer with aluminium smooth fascia. Maximum and minimum button to review max minutes. With re-set max min button on fascia. Button on fascia to change display from degree C to degree F. Magnetic backing so can be mounted on metal surface, plus also has fold out leg to stand on desk/shelf. Display has arrow indicators to show both temperature and humidity tendencies.<p>Temperature range: indoor 0 to +50 degree C (+32 to +122 degree F), Humidity indoor 20 to 90 percent. Wall mounting or table standing. 1.5 volts AAA Battery required but not included. Measures 86 mm width by 77 mm height by 21 mm depth.