IT WORKS .. Only for magnetic materials

Pro :
- user adjustable alarm threshold that some of its competition dont have.
.. Benefit - made it acutely sensitive to small difference in field discontinuity around steel and magnetic materials, thereby its detection capability and penetration.

Application :
- pre-detection routine : require a new threshold settings for acute result from :
- object to object,
- phone<>object relative orientations, as well as
- phones geo-orientation.

Next release nice to have :
- calibration button .. to register an ambient field average value when phones geo-orientation is prefixed and ready to go detect in that orientation. Then the software will set detection threshold at (K*average); where K is a threshold factor and is also user adjustable, default is 1.40.

i-Phone-4 about Metal Detector and Spy Camera