Portable photo witness?

What i stipulation is exactly what my question say. I need one that have some (not a hole lot) of memory. A port to put in a USB or an available extender (such as: a cord that you can plug contained by to it that gives you a port you may plug a USB surrounded by to) I work with seriously of photos, such as personal photography some modeling shots, and even some pictures of planes. I'm not that concerned about memory on the device that much seeing as to i enjoy most all my pictures stored on memory sticks. but i would approaching it to be able to zoom within and out on the photos, see and some times there are rise and fall small details on the planes. Thanks for any help

Portable photo witness?

Here are a few option -

http://www.digitalfoci.com/picture_porte...

http://www.42photo.com/productdetail.asp...

http://www.nikonusa.com/template.php?cat...

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