Need help in choosing the right scanner for documents?

Other option is to use a digital camera fixed on a tripod with the lens parelell to the earth. It takes less than a second to make a copy. With proper lightening the results are far superior to the scanning machine. In fact all high speed scanners use a digital camera and automated page turning. You can use a PDF printer software to convert the JPG image into a PDF document. It takes some trial and error to master the technique.