This is a metal detector app.
It uses the magnet sensor of your phone to measure the magnetic field around it. Metallic stuff normally produce a magnetic field which can be detected by this app.
Try it with wires in your wall. You will be amazed! :)
Please have a look at the YouTube video and the in-app help to get an idea how it works.
Tags: metal detector apk , metalo detektori , metalodetektori , metal detector , detector de metales apk , metal detector paradise .apk