I just have a simple borescope that I use Michael. We don’t get that in depth with sewer lines and chimney’s.
If the tub takes a half hour to drain, or if you drain the upstairs tub, and water backs up out of the basement shower, we recommend a plumber check it out. But, we don’t attempt to diagnose. I have used mine to look down sink drains, or find disconnected HVAC ducts.
That being said. I see these cheap scopes on Amazon that have a camera attached to a flimsy wire. Make sure it’s flexible, but somewhat rigid so you can pus/feed where it needs to go. Of course, a light at the camera and good resolution are a must.