So you can see the cylinder walls, top of the piston clearly? Then can you see the valves and the combustion chamber?I wanted one for the same purpose. I just googled borescope and bought a cheap one for an Android phone. Being a halfwit I couldn't think of a way to get the app from the disk to the phone so I searched and found an app. It also works from a PC. It says dbpower on it and works fine.