One of the best uses for endoscopes is in the automotive repair industry. Here we can see a video of a USB borescope for examining engine cylinder bores.
This is a fine example of how something as cheap as these USB borescopes can be used to build a business from. There are lots of people who would happily spend money to have a diagnosis like this done rather than spend countless hours stripping down a car or motorcycle to arrive at the conclusion that the piston or bore are damaged. They are tools that pay back for themselves in no time. Here are a few USB borescopes available now.