Review of the Epson WorkForce 840 All-in-One Printer. Epson advertises it as the world's fastest all-in-one printer. With features like wireless connectivity, large paper capacity, automatic two-sided color printing, copying, scanning, and faxing, the Epson WorkForce 840 all-in-one printer sounds great. We decided to take a close look to check out this printer's performance as well as its features.
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