... -8 1.convenient to use 2.patent product security equipment MD-8Feature:Easy to operate;The large detecting ... 11cm;Coin: 9cm;Paper Clip: 4cm.Where to use:Airport, station, dock for security check;Custom, police, border, security, government department;Bank, hotel ... food industry for quality inspection;Big event, sports, Fair, for security check;Noble metal detecting, in gold, silver or jewelry industry ...