iphone/ipad metal detector app?

[e9999]

anybody knows of one that works reasonably well?
A cute trick no doubt but could actually be useful in the field in a pinch? How (in)sensitive is it compared to a real metal detector for real life applications, if you know? (As in you lost something, say a critical nut, in tall grass etc)

 

[PAToyota]

I sort of question how that would work well.

I picked up one of these for woodworking: Buy Little Wizard II Metal Detector at Woodcraft

Found that it works great for just the use you mentioned.

 

[arcteryx]

I have a MD and after I find the general area, I use this pin-pointer. I think this would suffice for your needs. Works pretty well.
Metal Detector