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As is shown in the name, hand held metal detector is a kind of detector which is specialized for metal detection. The best metal detectors can even detect a needle. Usually, hand held metal detectors are used in the airports and railway stations. However, there is another application which is the most important. Almost all people should have experienced the examination. When taking part in an important examination, before you enter the classroom, the invigilators will use the best metal detectors to detect whether you are carrying any communication equipment with you. If there are, the hand held metal detector will alarm. Therefore, before the examination, you had better take off your belt, watch, and any other metal objects to avoid the alarm of the metal detector. If you are in need of the cheap metal detectors, Eastimage must be your best choice. You can rely on us and we promise to provide a cheap metal detector of high quality.