Smart Digital Thermometer Hygrometer with Humidity and Temperature Monitoring. This mini digital hygrometer features two icon indicators. When humidity is between 40% and 70%, a smiling face is displayed. When humidity is below 40% or above 70%, an unhappy face appears, allowing you to quickly assess indoor air conditions for a healthy and comfortable environment. (Normal deviation: 2C and 5% RH)Temperature Measurement Range: -10C to 70C. Temperature Accuracy: 2C. Readings are updated every 10 seconds.Humidity Measurement Range: 10% RH to 99% RH. Humidity Accuracy: 5% RH.Compact Design with Long Battery Life. This digital thermometer hygrometer is small, durable, and portable, making it easy to place or carry anywhere.Wide Application. Suitable for use in homes, offices, cars, schools, hotels, laboratories, kindergartens, aquaculture facilities, workshops, libraries, factories, and air-conditioned environments.