As electronics get smaller and smaller, you'll need a hand examining PCBs and USB Microscope - 5MP interpolated 220x magnification is the perfect tool. It is smaller and lighter than a large optical microscope but packs quite a bit of power in its little body. There's a 5.0 megapixel sensor inside and an optical magnifier that can adjust from 20x (for basic PCB inspection) to 220x (for detailed inspection). Eight white LEDs are angled right onto whatever you're examining so you get enough lighting to see, and are smoothly adjustable via a dial on the side.
If you plug USB Microscope - 5MP interpolated 220x magnification into any computer, it just shows up as a standard USB camera and the Windows/Mac software lets you take snapshots using the button on the side of the microscope or direct from the software (so you don't move the camera).
USB Microscope - 5MP interpolated 220x magnification is the best combination of optical clarity, usability, and price. It's perfect for electronics hacking, rework, SMT (de)soldering, inspection.
Package comes with a USB microscope with 4.5ft/140cm long cord and a small adjustable stand.
Software & Driver download - There's a manual in the ZIP but its for the older version of this camera, the specifications listed there will be for the older camera which you can disregard. Software is not compatible with MacOS X Mavericks.
Adafruit Product Page: https://www.adafruit.com/products/636