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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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
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Example sentences
When you go through a metal detector at the airport with a conductor such as
  keys in your pocket, the alarm goes off.
As with everything else, have your bag of medicines ready to hand to the
  officer at the metal detector.
After an hour, the metal detector squeaks, then emits a louder shriek.
It is best if you wear your hearing device while going through the metal
  detector.
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