[Air comfort indicator] Temperature, humidity and environmental level icons. Divided into three levels Dry / Comfortable / Wet, it is a good help to adjust temperature and humidity. When the temperature is 18 26 and the humidity is 30% 69%, the arrow automatically points to the green COMFORT icon. When the temperature is 18 26 and the humidity is 30% 69%, the arrow automatically points to the green COMFORT icon [2 Sense and Quick Sense Contacts] The thermometer and hygrometer update the reading every 10 seconds, keeping you up to date with the latest temperature and humidity reading changes. (The temperature measuring range is -9 ~ 60 ) [Memory function and minimum / maximum recording] Digital Hygrometer can memorize the highest and lowest temperature and humidity in 24 hours. It is a good partner to take care of children and the elderly [High precision and / conversion] Indoor thermometer can get fast and accurate data over time when the air flow passes through the vent. And you can switch between Fahrenheit and Celsius [Longer battery life] The indoor thermometer and hygrometer are powered by 2 AAA batteries (not including batteries). It is very suitable for use in your nursery, greenhouse, office or wine cellar Product Mini Indoor Thermometer Digital HygrometerThe hygrometer measures temperature and humidity with great precision to keep your living environment in the best conditions. The temperature and humidity monitor provides you with the latest high and low temperature and humidity records daily. The devices extremely sensitive humidity sensor refreshes every 10 seconds to provide you with the latest readings. Tips Do not expose them to extremely high or low temperatures, as this may damage electronic parts and plastics. If you plan to store it for several months, remove the battery. The small triangular hand is not displayed when the humidity is between 30% and 69% and the temperature is not between 18C - 26C. Package 1 x Indoor Thermometer Hygrometer 1 x User Manual Comfort Level Indicator Dry (orange): Humidity less than 30%. Comfort (green): Humidity between 30% -69% and temperature between 18C-26C Humid (blue): Humidity greater than 70%. No icon: none of these conditions are met High Low Records The precise hygrometer digital thermometer displays high and low temperatures and humidity, always ready to respond to changes in the environment. The thermometer can be set in degrees Celsius or Fahrenheit, and can be switched by the C / button on the back. High Precision Fast Refresh The digital room thermometer refreshes every 10 seconds to give you the most recent readings. The built-in thermometer has a high accuracy of 5% RH and 1 C. The measuring range is -9C to 60C (16F to 140F) and humidity from 20% to 95%.