A free app for Android, by TVApp.

How does this work?

When you move the device, the sensor will detect any magnetic field and measure the value.

This application is used to detect the presence of metals. The app also provides a visual representation of the data measured.

The app will make a sound and begin to vibrate if you are close to a detected metal object.

The accuracy of this app depends on the magnetic sensor in your device and is affected by electrical equipment such as TVs, computers, etc due to electromagnetic waves.