The thermometer app is a useful tool for measuring the temperature in your surroundings. It utilizes your phone's built-in thermometer sensor to accurately display the indoor temperature. However, if your phone does not have this sensor, the temperature is calculated based on the battery temperature. This feature may not be as accurate as the built-in sensor, but it still provides a general idea of the temperature in your surroundings. Additionally, the app calculates the outside temperature using data from the nearest weather station. This feature is particularly useful for those who want to know the temperature before heading out.

It is important to note that this thermometer app is not suitable for measuring your body temperature. The app is designed to measure the temperature in your surroundings and not the temperature of your body. Therefore, it is not a substitute for a medical thermometer. If you need to measure your body temperature, it is recommended that you use a medical thermometer specifically designed for this purpose.

Overall, the thermometer app is a helpful tool for measuring the temperature in your surroundings. It utilizes your phone's built-in thermometer sensor or calculates the temperature based on the battery temperature if your phone does not have this sensor. Additionally, the app calculates the outside temperature using data from the nearest weather station. However, it is important to note that this app is not suitable for measuring your body temperature and should not be used as a substitute for a medical thermometer.