Renting the wrong remote visual inspection or nondestructive testing equipment for your inspection is more common than you may think. Each individual field of NDT has its own challenges and considerations depending on the application.
Learn to recognize the symptoms of renting incorrect RVI equipment. Are you renting your borescope from someone that just rented a boat or finished selling some PPE gear a few minutes ago? If this is the case you may want to look elsewhere for an expert in remote visual inspection.