I actually have a camera I use for fishing that would work. I will look around when I get the fuel level down.Borescopes/endoscopes are extremely inexpensive (and should be in every mechanics/homeowners tool kit). If you are just looking inside a wall cavity for a a wire, inside a pipe for an obstruction, or in my case yesterday inside an a/c unit for a problem they are the tool. High grade ones are expensive but cheap ones are usually < $20 on amazon.