Thermometer

'Thermometer' uses your devices's built-in battery temperature sensor to measure the ambient temperature. The app does not simply read the battery temperature and report it. The battery temperature depends, in part, on the current supplied by the battery from running various processes on the Android device, such as the screen, CPU and sensors. In addition, the battery temperature will also be greater than the ambient temperature if the device is held in your hand or kept in a pocket.
This app circumvents these potential problems by keeping track of the device's motion and screen status (on or off) using its built-in sensors. From these data, the app only records the battery temperature if the device has been sitting motionless for at least 20 minutes with the screen turned off. There is no need for you to wonder if you device has been sitting still long enough for a good temperature measurement. 'Accurate Thermometer Free' keeps track of this in the background and updates the temperature on the display when certain criteria have been met.
The displayed temperature is accurate to about 1 degree Centigrade. The display also gives the date and time the temperature was determined.