Review: PNF Duo Pen

The PNF Duo Pen is an interesting device that brings some touchscreen tablet functionality to standard laptops. You attach the USB receiver onto your laptop's screen in a similar way to a webcam, which responds to the movements of the pen itself. Instead of a clip for the receiver, however, you tape a small magnet onto the back of the screen, which allows the receiver to be attached quickly and firmly. Although this solution works, a clip would have been much more preferable. The outer shell of

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