Thank you for using EMF detector and radiation detector app.avoids getting your phone near powerful electrical devices like power transformers since you might damage it. Use at your own risk.If you open the app and the readings are 0 it means that this app can't work on your phone.. If your phone doesn't have this sensor the app is NOT going to display any measurements.NOTE that EMF detector and radiation detector app uses the magnetic sensor.EMF radiation detector mobile app will detect the com