Library EM system XLD-EM-01 high sensitivity. frequency: 10 hz Suit for library, store ... Supermark Library EM system Product Model: XLD-EM-01EM-01 Commodity Pickproof and Inspection Instrument has referred to massive digital ... low cost of applicationVery good invisibilityWide ApplicationsBookstore Supermarket, Library, A&V Store, Drugstore Supermarket, Cosmetics Supermarket, and Various Open ...