Metal detector on a chip resolution of 0.015uT

[Tec]

Sorry if this has already been posted.
Who has used one ?

I think it could detect small iron at metal detecting depths (used as discrimination on PI)

Sensitivity of < of 1/1000th the earths' magnetic field strength
48 bucks

http://www.sparkfun.com/datasheets/Sensors/MicroMag3%20Data%20Sheet.pdf

Tec