TheScience Channelexplains how a modern vending machine uses specific lasers, scanners, and sensors to detecteach coin that is dropped in, and to discard any fakes.
Read more: http://www.viralviralvideos.com/2016/04/25/how-vending-machines-detect-specific-coins/
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source http://www.millermachine.net/how-vending-machines-detect-specific-coins/
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