You can use your smartphone with suitable scanner app to scan a file, but if you need to scan various files frequently, the following ballpoint pen with portable scanner may be more suitable for you.
This is a multi functional ballpoint pen with integrated scanner that measures 6-1/2 x 2/3 inches and weights 2 oz. As we can see from the images, using the ballpoint pen you can conveniently take notes, and it also ships with an ink cartridge. Most importantly, the ballpoint pen features a built-in high-precision auto-focus lens and a 5-megapixel sensor so it doubles as an easy-to-use portable scanner. Just pressing the shutter button halfway projects a visible red laser frame onto your document, and before the picture is taken the pen-sized scanner can automatically focuses on the area for clear image, moreover, the built-in 1GB flash memory stores up to 1000 scanned pictures in JPEG format. Apart from that, the portable canner is also a practical voice recorder, and also ships with a leather case.
The ballpoint pen with portable scanner is priced at $124.95 USD. If you’re interested, jump to Hammacher Schlemmer online store for more details.