I haven't used it yet on anything but I just took delivery of one of these:

eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

It's brilliant. I may have to take back everything bad I ever said about the Chinese. The head is about diameter and half the length of an unfiltered cigarette. The focal length seems to be around 3 inches and out. The clarity is great on a PC. You can turn this on and save the inspection as an avi file on your pc and then pause , zoom etc. This belongs on everybody's X-mas list. You can even save money on certain medical exams...

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