EMF (Electromagnetic Field) is an invisible, natural force that affects all objects with a magnetic field. This force can be used to create a magnetic field in a specific place. The strength of the magnetic field and its effects depend on the type of object, the strength of the electrical current and voltage in the surroundings, and the distance between the object and the magnet.

If you are searching for a fun and easy way to detect metal, you can use your phone as a metal detector. The app uses the built-in magnetic sensor to detect any metal objects in your surroundings. The app makes a loud sound when it finds a metal object, so you can easily locate the object and find out what it is made of. The app can also detect electric wires and pipes in the walls and the ground.

If you have a doubt about the accuracy of the results, you can easily check the accuracy by moving the device around.