Metal detector

how to get gold ???? where can you find gold ????? how do metal detectors work ???? Emf in nature is about 49 µT (micro tesla) or 490 mG (milli gauss); 1µT = 10mG. If any metal is near,
the value of magnetic field will increase.
Metal Detector is an application which detects the presence of metal nearby by measuring the magnetic field value.magnetometer
This is an useful tool that uses the magnetic sensor built-in your mobile device and shows magnetic field level in µT (microtesla).
The magnetic field level (EMF) 1 gauss to tesla

Metal Detector allows to identify any metal object in area tesla, because all metals generate magnetic field which strength can be measured with this tool.
How to use :
launch this application on your mobile device and move it around.
You will see that the magnetic field level shown on screen is constantly fluctuating.