I have a couple of borescopes, and each has something it does well. The first one I bought was a Milwaukee 3150-20 with a 5mm camera. The tip does not articulate but the wand is stiffer than most and you can kind of pre-shape it to go where you want. It’s great for looking deep into a cavity such as a wing or tail section because the camera wand will hold a shape and support itself as you advance the camera, so you don’t need a guide tube. It also has an 8mm camera for a larger field of view (sold separately). It’s not a great cylinder borescope, but I end us using it the most for other types of inspections, or to find a part I dropped into a difficult area.
Later I bought an ATS Voyager, which was twice the money but has two way articulation and video out for real time viewing on a larger screen. It handles/controls very well and is superior in a cylinder or other areas where a very flexible, articulating camera is important. These are not just engine tools, once you have one you end up using it for all kinds of things. Cylinder bores of course, but you can also inspect deep into small hard to reach areas, and you can get a closer look at items you may otherwise only be able to see at a distance.
