Indoor temperature – you have to notice that not so many devices have ambient sensor installed, so mostly this is electronics device temperature. Devices without this sensor have to be leave for about one hour in stand-by mode to get proper data.
Outdoor temperature – reached by weather web service. You need to have network connection and Location Services enabled.
Location Services is needed to locate your device's geographical parameters.
By default data are presented in Celsius units. Using settings option You can change it into Fahrenheit as well.
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Related tags: download Thermometer Free, Thermometer Free for Android