1. Reliable accuracy - Temperature measurement range: -20°C to +60°C, temperature measurement accuracy: ±1°C, temperature resolution: 0.1°C. Humidity measurement range: 10%RH to 99%RH. Humidity measurement accuracy: ±15%RH. Humidity resolution: 1%RH. This improved digital indoor hygrometer is more accurate and easier to use. The readings are updated every 10 seconds to provide the latest and most accurate temperature and humidity values. 2. Easy to read - The mini digital hygrometer has 2 symbols. If the temperature is between 22 - 28°C and the humidity is between 40 - 74%, the thermometer will display a smiling face; otherwise, it will display an unhappy face. Larger fonts are used to show the current temperature and humidity. You can even read the readings from a long distance. 3. Newly upgraded indoor thermometer - Our improved thermometer features a push - button switch and the function to convert between Fahrenheit and Celsius. Double - click the button to switch the temperature unit. Long - press the button to turn the thermometer on and off. You can choose your usual temperature measurement unit. When you don't need to monitor the temperature, you can turn off the thermometer to save energy. 4. Long service life - Dimensions: 4.3 x 4.3 x 1.3 cm, weighing only 21 grams. This hygrometer thermometer is small, durable and portable, so you can save space and carry it with you. The vivid visual display helps you instantly understand the humidity, monitor the temperature and humidity at home, and prevent colds, dry skin, asthma, allergies and mold. 5. Wide application - The hygrometer has multiple installation options. It can be placed on a table or bookshelf, or stuck on the wall with wall stickers. You can use double - sided tape to fix the indoor thermometer. Stick it anywhere or similar places, such as in the refrigerator, on the counter, in the living room, baby's room, kitchen, basement, office, greenhouse, guitar room, office, garden.