You want to hammer a nail or drill a hole in the wall, but you are not exactly sure
where the wires for the power outlets go through.

Now, with the help of "Find the Wire" you can pinpoint the exact location.
To do so, plug in any powerful enough (greater than 300W) household electrical appliance and turn it on.
Press "Set Base" to establish the zero level according to ambient magnetic field.
Bring the back of your iPhone close to the wall and start to move it slowly.
When the iPhone comes close to the wire, through which current flows,
you will hear a sound signal, the chart will indicate spikes,
and the level will be indicated on the display above the button.
When the star is located precisely above the wire, the sound signal, the size of the chart, and the level will all be maximized.
To confirm the measurement, rotate the iPhone 90 degrees around the perpendicular screen axis and repeat the steps.

Please be advised, that the result might be affected by the presence of other metals, magnets, or even ghosts if any,
so take all necessary precautions when drilling a wall.