Enjoy the free version of Ghost Box EMF Radar 1

Once you start the app, place the smartphone/tablet on a flat surface, don't touch or move it afterwards, as it would influence the signal meters in a bad way (false positive results).

You can change the trigger level from low (1) to high (3), enable and disable GPS and/or EMF meter. You may also collect your GPS data and save it for future purpose and investigations, you may also view them in your googlemaps or Google Earth (won't be shared with others, it's kept for your eyes only).

The app will react if there are major changes to the GPS ICs and/or EMF ICs in your device.