metal detector

noun
an electronic device for detecting the presence of metal objects, as one used as a portable sweeping unit or one emplaced in an archway at an airport terminal to detect concealed weapons, explosives, etc.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
metal detector
 
n
a device that gives an audible or visual signal when its search head comes close to a metallic object embedded in food, buried in the ground, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Metal detector is always a great word to know.
So is gobo. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
Visual inspection of the surface will be done, when possible, concurrently with
  the metal detector survey.
If the metal detector beeps, you will be asked to step back and check your
  pockets again.
If you have a pacemaker, tell the security officer about it before you enter
  the metal detector.
It is best if you wear your hearing device while going through the metal
  detector.
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