Who has one? What brand? How do you rate it?
Getting ready to do a few Pre-purchase-inspections for new projects and came across these a few weeks ago... looks like the tech has come a long way in a few years from the magnet style.
This one looks reasonably price and does Ferrous and non-ferrous
http://www.paintgages.com/
This one only lists for Ferrous metals....
http://www.omega.com/googlebase/prod...z1KRoCoHjw_wcB
This one offers ferrous and non-ferrous
http://www.worldoftest.com/positest-dft.htm
This one also does both but I don't see a price..
http://www.worldoftest.com/positector6000.htm