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Is there any benefit to this device over a PC microscope?
1. Usability. The field of vision on a USB microscope is very small, whereas this displays a comparatively much larger area, depending on your magnification level.
2. Range of magnification. While a USB microscope is good for examining very small areas at very high magnification, its range is very limited, and you effectively have 2-3 magnification settings. This device covers a much larger range, as shown in the OP.
3. Because you can ONLY view at very high magnification on a PC USB microscope, I find them very difficult to control. A tiny jerk of the hand can shift the entire area out of focus. For anyone with fine motor control issues or just general clumsiness, the document table is going to be MUCH easier to control. With a PC microscope you're moving the optics or trying to keep the optics still while moving the stamp (it's tougher than it sounds to do consistently and easily), whereas with this unit, the optics and lighting always remain stationary. You're only ever moving the stamp/cover/document.
Also, it's easy on this unit to zoom out several levels of magnifcation, move the object, and zoom right back in, if you prefer doing that to panning.
There's nothing that this inherently does that a USB microscope can't do... it just does it better and easier.
I have a USB microscope... I almost never use it, because it's a pain in the ***. This isn't.