?Indoor and Outdoor Thermometer?8 inch diameter round outside thermometer is a trustworthy temperature and hygrometer (humidity measurement) readings to your outdoor space. ?Easy to read?The outdoor thermometer decorative easily keep track of the temperature from a distance with bold black dial graphics. ?Celsius and Fahrenheit?This garden hygrometer digital simultaneous Celsius and Fahrenheit temperature display. ?Real glass lens?This room indoor thermometer real glass lens accurate between -40 and 120?/-40 and 50 °C to accommodate all climates. ?Calibrate Automatically?This weather thermometer a precision-made thermometer coil ensures accurate readings.The thermometer will calibrate automatically just place it at a fixed location. After 2 hours the pointer will match the local temperature automatically.