Wacool; Digital Thermo-Hygrometer. Temperature range: 10-48.8degree celcius. Accuracy +/-(1) degree celcius. Hygrometer humidity range: 20-90%RH. Accuracy +/- 5%RH. User can use in both modes celcius and fahrenheit. IN and OUT switch. IN shows the temperature of the place where the unit isw placed. and OUT means it displays the temperature of the place where the sesor placed. it also displays maximum and minimum temperature.