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The DH640 In-Line Document Holder from 3M positions directly between monitor and keyboard. It has a weighted base that allows the ledge to dip below the desk edge. It has an elastic line guide that marks your place and keeps pages open. The 18" wide backplate supports books, catalogs, and just about any size document. Its angle and height can be adjusted. By keeping documents positioned as close to your computer monitor as possible, you can reduce eye, neck, and shoulder strain to enhance comfort.