Use your phone's built-in magnetics sensor to detect metals that distort the natural magnetic field.
Technically speaking only metals that contain ferrimagnetic elements such as iron, nickel and cobalt will register variations onscreen.
When a ferrimagnetic metal object obscures the natural magnetic field and the result is shown realtime on the graph. Different shapes and sizes of metal contain ferrimagnetic elements will all register in a different ways; long thin items like screwdrivers seem to have to greatest effect so have fun experimenting!
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