Easy to Use and Read: Open the back cover, install the button battery(included), and then it starts to works. 2.55 inch LCD Display temperature and humidity at the same time. Reading in Celsius is available with a C/F button at the back side. Accurate: Temperature detection range:14- 122(-10-50),Hygrometer detection range:20%-99%. Temperature measurement accuracy is within 1 . Accurate Temperature and humidity Providing you with accurate data of temperature and humidity in real time and the trend of temperature change. 2 TYPES PLACEMENT: You can put it on the refrigerator with its strong magnet on its back, and place it on table-top with its retractable stand. Big Figures and Large Screen: Portable hygrometer indicates humidity and temperature data on the big sleek screen. Easy to read even at a distance. Widely used: with the temperature and humidity monitoring, the digital LCD thermo-hygrometer can be used in houses, offices, workshops, schools, markets, warehouses, etc.