Metal Detector Professional is an application to detect the presence of metals such as iron, steel, copper, and aluminum. It works by using a magnetometer, which is a built-in magnetic sensor. The sensor is able to detect any metal that has a magnetic field. The magnetic field level is in the range of 30 to 60 microtesla (µT). If the level is higher than 60 microtesla (µT), it might mean that the phone is near to ferromagnetic materials (metallic objects).

This application can be used to detect the presence of metals in the walls and the ground. It can also be used to detect any metal objects that are under the ground.

It is a very good idea to use this application around electronic devices, such as TV sets or computers. It's better not to use it around such devices.