Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A metal detector is an electronic device that works thanks to the transmission and reception of a radio wave signals when close to metal. Though, metal detectors work differently, they all have nearly a same configuration. Used in mining, construction industry, detection of explosive devices, as well as hobbies in finding old coins, gold and other precious metals – metal detector could detect the amount of money a person is carrying, according to a recent research. To find out more about metal detector, its history and potential applications – read this book.