Anyone use a borescope for cylinder inspection?

i got a zealtron i bought off amazon for 30ish bucks! got 2 screens, 2 cameras, and 2 lights! ant used it to look inside cylinders yet but it would!! i bought it to look at plastic piston cooler nozzles in big cam cummins when thay have oil pressure issues! every couple weeks i find myself dragging it out and always glad i splurged for it!! that got some cheaper that link to your cell phone for display but mine got its own screens! good luck!