EMFGuard

The EMFGuard is a good choice if you want to measure the electromagnetic fields around you. This app uses phone's built-in sensor for detecting Electromagnetic waves around you.
EMFGuard is simple app to detect electromagnetic fields, devices, metals, and amaze your friends with what your phone can do. Watch out because, some people might believe that the sudden changes in the EM field could might indicate the presence of the paranormal entities.
EMFGuard use this app to measure and study electromagnetism and magnetism, earths geomagnetic field and much more. It can be used as detector not only for the EMF but also for metals, magnets, devices, entities and ghosts.
To use the EMFGuard, you just have to move around your phone in your room or in your surroundings to find out if there are any EMF radiations. EMF Meter gives the magnetic field reading in µT (microtesla) which is eqauls to 10 mG (milligauss).
EMFGuard uses magnetic sensor (compass) of your’s phone and displays the reading with a Digital meter, and a classic LED’s needle meter.
Disclaimer:
EMFGuard app uses the Magnetic Sensor. If your phone doesn't have this sensor the app is not going to display you any measurements. If you would open the app and the readings are 0 this means that this app could not work on your phone.
Avoid getting your phone near powerful electrical devices like transformers etc, since you could might damage it. Use at your own risk.
The EMFGuard app does electromagnetic field detection by using phone's built-in sensor called magnetometer. Readings may vary due to quality of mobile phone sensor.