Widget displays the temperature of the device battery. After calibration it can be used for measure surround temperature. For calibration you need: 1. Turn off unused applications (to reduce power consumption, warming up the battery). 2. Leave the phone next to the thermometer for 10-15 minutes.  3. Set the temperature calibration in the widget's settings, so that its temperature coincides with the thermometer. To measure the temperature you need:   1. Turn off unused applications (to reduce