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There are tons of crappy borescope options out there. I've tested 2 of the shittiest ones from Harbor Freight and can happily report that they are shitty.
Does anyone out there have experience with anything good? I'd love to have:
1. Most inexpensive (I didn't say cheap).
2. Ability to inspect valves (180deg bend or mirror).
3. very close focal point (probably most important, our cylinders are small compared to like the aviation guys, who use them all the time).
4. good lighting
There are $20 to $20,000 options out there. Who has something they actually like?
I ordered one of the WiFi ones today. It should be here tomorrow. It has much better reviews than the USB one. I did not order any mirrors, but they have kits.
I used to work for a medical instrument company, I still have a 3mm 30 degree sinus endoscope. It’s pretty rad. It has light fibers at the periphery of the lens so you can light the field of view. The optics are amazing.
You wouldn’t want to pay what the hospitals pay for these things, but they do show up on Ebay once in a while. Only issue is that they’re pretty fragile.