Anyone use a borescope for cylinder inspection?

Just started messing with my multi camera hand held borescope. So far it works well for what I need. Resolution isn't bad. Has lots of nice features like 3 light settings, photo, auto off, and 3 camera angles. Takes a little work to move camera around due to stiffness of the (16'?) camera probe wire but better than being floppy. This is where an articulating unit would be better but good enough for me for what little use it will get.

Looking down at piston
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Looking up to valves at an angle.
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Top of cylinder at ridge
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