Easy to Set - Only 3 three buttons to set this thermometer hygrometer. ADJ - Setting current time. MAX/MIN Button - Press "MAX/MIN" button to read the maximum and minimum temperature and humidity values. MODE - Setting current time and 12h/24h display. Large Visible HD LCD Screen - Clear and obvious display of temperature and humidity values. Easy to read numbers. With strong magnet - work well on the refrigerator also has a stand so it can sit upright. 12h/24 time display models, just press MODE button to change. Switch from Celsius to Fahrenheit, just use a small substance to insert it into the hole on the back of the thermometer and find the button to push. Widely used for food, homework, gym training, sports, games, office etc. One button cell power supply (not include), remove the prepared battery to another hole to start working. Basic skills: Indoor temperature and humidity display Time display Temperature switch display / High and low temperature memory function and simultaneous display of recorded time 12/24 hour clock Daily alarm function Comfort level display Temperature measurement range: -10C-50C (+14F to +122F) Humidity measurement range: 10%RH-99%RH Body size: 82 70 20 mm Use battery: 1.5V (AAA) 1not include) common sense of life After measurement, experts believe that the indoor humidity is as follows: Room environment: 40-70%RH Environment conducive to disease prevention and treatment: 40-55%RH Storage environment for books and cultural relics: 40-60%RH Storage environment for computer and electronic equipment communication: 45-60% RH Cotton wool textile storage: 40-60% RH Dairy product storage: 50-60% RH Candy and dessert storage: 50-60% RH Vegetable and fruit storage: 50-70% RH Grain storage: 50-70% RH Quantity delivered: 1 piece becomeveryrich