It only uses S4 build in sensors!!!
-Notification Bar (Temperature)
-2 different app widgets (8 more in paid version with color and transparency customization)
-Works without internet connection
Measures the ambient temperature, humidity and pressure.
-°C or °F selection.
Use it only for reference , it is not for professional use. It only uses device sensors.
How to use;
-Don't put your S4 to direct sunlight.
-Put it on a flat surface and wait some time for exact results