A read tunnel device for scanning a plurality of cartons of high density packaged items, the read tunnel device comprising: a read chamber; a radio frequency identification, RFID, scanning enclosure for reading the plurality of cartons; a conveyor belt for moving the plurality of cartons through the enclosure; and at least one antenna positioned within the read chamber; and wherein: the at least one antenna projects radio frequency energy to read RFID tags attached to the items; the read tunnel device is positioned over a section of the conveyor belt, such that the plurality of cartons on the conveyor belt pass directly through the read tunnel device; and the RFID tags on the items are energized and read in the read chamber by a reader and signals are transmitted back to the reader, identifying the cartons and transmitting information that the RFID tags contain; characterised in that the enclosure comprises a tube angled down from the conveyor belt so a carton will transit down the tube using force of gravity, wherein the tube is configured to induce the cartons to tumble in one or more dimensions as they transit through the read tunnel device, changing arrangement of the items within the cartons but also changing read direction with respect to the at least one antenna in the enclosure. a read chamber; a radio frequency identification, RFID, scanning enclosure for reading the plurality of cartons; a conveyor belt for moving the plurality of cartons through the enclosure; and at least one antenna positioned within the read chamber; and wherein: the at least one antenna projects radio frequency energy to read RFID tags attached to the items; the read tunnel device is positioned over a section of the conveyor belt, such that the plurality of cartons on the conveyor belt pass directly through the read tunnel device; and the RFID tags on the items are energized and read in the read chamber by a reader and signals are transmitted back to the reader, identifying the cartons and transmitting information that the RFID tags contain; characterised in that the enclosure comprises a tube angled down from the conveyor belt so a carton will transit down the tube using force of gravity, wherein the tube is configured to induce the cartons to tumble in one or more dimensions as they transit through the read tunnel device, changing arrangement of the items within the cartons but also changing read direction with respect to the at least one antenna in the enclosure. the at least one antenna projects radio frequency energy to read RFID tags attached to the items; the read tunnel device is positioned over a section of the conveyor belt, such that the plurality of cartons on the conveyor belt pass directly through the read tunnel device; and the RFID tags on the items are energized and read in the read chamber by a reader and signals are transmitted back to the reader, identifying the cartons and transmitting information that the RFID tags contain; characterised in that the enclosure comprises a tube angled down from the conveyor belt so a carton will transit down the tube using force of gravity, wherein the tube is configured to induce the cartons to tumble in one or more dimensions as they transit through the read tunnel device, changing arrangement of the items within the cartons but also changing read direction with respect to the at least one antenna in the enclosure.