Plustek opticpro a320 takes the pain out of large format scanning it is usb 20 scanning device that can scan an a3 size document with high quality resolution as high as 1600 dpi and scanning area as large as 12 x 17 3048 mm x 4318 mm in just 112 seconds often large format scanning is considered to be complex but plustek opticpro a320 makes is very easy for the end user with its seven one touch function buttons whats more it comes bundled with highly effective image processing a