Good Gear Guide
In Pictures: Swiss Army smartphone - 7 tools your ...
Some tasks call for a microscope -- like looking for clues, or checking watermarks on paper money.
Sure, you could pack a USB microscope that uses your tablet or notebook as a display -- but for seriously mobile microscope users, there are magnifying attachments for your iPhone, Android phone, or other mobile devices. (Most of these comprise the actual microscope plus a device-specific case.)
In Pictures: Swiss Army smartphone - 7 tools your phone can replace