【Digital for a Healthy Indoor Environment】: This mini thermometer/hygrometer allows you to check the temperature and humidity with a clear display and instantly monitor the indoor environment of your most frequented rooms, such as bedroom, bathroom, children's room, warehouse, basement, greenhouse, etc. Advanced Precision Sensor: This indoor hygrometer is equipped with an accurate and highly sensitive sensor that updates the temperature and humidity every 10 seconds. Temperature measurement range: -50°C to 70°C. Temperature measurement accuracy: ±1°C. Indoor/outdoor humidity measurement range: 10% RH - 99% RH. Humidity measurement accuracy: ±5% RH. The digital hygrometer's measurement unit is available in Celsius or Fahrenheit. 【Smart Digital Thermometer/Hygrometer】: This mini digital hygrometer displays two symbols. If the humidity is higher than 40% or higher than 70%, you will see a smile. If the humidity is below 40% or above 70%, you may feel frustrated. Quickly signal your air