Mach1 Driver
Well-Known Member
I've not used this but its an interesting tool if it works for less than 20 bucks. Just hook it up to your smart phone and take a look inside a cylinder.
https://deals.slashdot.org/sales/en...erfeed&utm_campaign=endoscopic-android-camera
https://deals.slashdot.org/sales/en...erfeed&utm_campaign=endoscopic-android-camera