Metal Detector-Magnetometer, an application for measuring the magnetic field around your phone.
The app is easy to use and does not require special permissions.
This app uses a special built-in magnetic field sensor.

*If your device does not have such a sensor, the app will not work.*

The magnetic field is the area around a magnet in which the effect of magnetism is felt. We use the magnetic field as a tool to describe how the magnetic force is distributed in the space around and within something magnetic in nature.
The magnetic field around the device is measured in µT.
You can try to find both different metal objects and valuable metals. Try to find the treasure!