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This bizarre tool I own actually solves a real problem (and it's only $7 on Amazon)
This tiny device was made to inspect ear canals with its HD camera - but I've found it works great as a pocket-sized inspection tool for just about anything.
But they're typically large and bulky, designed for mechanics and HVAC engineers, which limits their usability when it comes to inspecting device ports or probing around cracks and crevices looking for a lost fastener. In my quest to find a small, portable, low-cost camera for confined spaces, I found this one from Amazon, designed specifically to inspect ear canals. Adrian Kingsley-Hughes/ZDNET There is a little metal prong on the end of the unit that takes little silicone sleeves for digging about in your ear canal, and you can choose to keep this or snip it off.
Or read this on ZDNet