Cheap borescope review

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looks like that one costs $10-$30, and pics look like you got what you paid for. They are indeed nice to have and great for basic inspection, preventing over cleaning, etc. There are lots of inexpensive options now, where just a few years ago there wasn't
I bought the rigid 26in teslong and posted about it elsewhere.
https://www.amazon.com/teslong
The side mirror is adjutable, and has a tiny locknut on it. This enables you to change focus for different calibers. It can also be removed for a Birdseye view like yours. Here are some samples of a 303 chamber and throat.
Had it for a year or so now. It's very durable - manufacturer is kind enough to include 3 extra side mirrors - knowing they are small and likely to get lost.