HTC HD2 as a metal detector? There's an app for that

A developer called '6Fg8' from xda-developers forum has made a proof-of-concept app that turns the HTC HD2 into a metal detector. The app is the pre-alpha 0.0.0.1 release, so it needs improvement in many ways.

How it works:
The built-in compass uses the earth's magnetic field to calculate the deviation from magnetic north. As with every compass, if you put a piece of metal nearby, it gets deviated. Thats what i use here to detect metal.

Testing:
Place your device flat on a surface. After starting the app, the gauge should show zero. If it doesnt, take your device and write a couple of "eights" in the air (this is to get rid of magnetism which might get stuck in the sensors). Then use a pair of scissor or something the like and move it slowly to the right side of your device. At a distance of approx. 5 cm. the gauge should start to move. Take your device and move it with its right side near metals, and see if the gauge shows values.

For more information about download you should head over to xda-developers forum.