I needed to look under the deck of my boat recently and my Rigid brand borescope just didn't cut it and wouldn't reach deep enough. I searched online and picked up one that I'm pretty happy with. It connects to my phone via wifi through a free app available at the Play Store. It has good color resolution and autofocus. I can choose 1600x1200, 640x480, 1280x720, or 1920x1080 resolution. You can save videos and snapshots. It was only $36. It's one of those gizmos that you might not need often but when you do, nothing else can do the job.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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