I just got a boroscope from my Snap on buddy for $430. It sounds like a lot, but this one has a remote screen that you can set up on a desk, or even hook up to a TV screen. Great for looking down cylinders, and around tight areas, following wiring and can prevent the removal of plastics. Once you have it , you tend to use it more thatn you think. I have a colonoscopoy coming up next month. You can imagine the suggestions I'm now getting from fellow ST'ers.
John
John