Metal Detector - Magnetometer EMF - measure magnetic field value using a magnetic sensor that is built into your smartphone.

Now You can easily find metallic objects that are hidden underground behind walls etc. or be a treasure hunter or ghost hunters also see a reading trend through the graph.

Simple app in your device called Gauss Meter are used for measuring the Earth's magnetic field but can't detect silver gold copper coins (non-ferrous - no magnetic field).

This Magnetometer app require a magnetic sensor otherwise does not work.

Enjoy !