Probably the least interesting piece of equipment he has. Anyways, at his latest video he has pretty pedestrian scope (~$2k) https://www.youtube.com/watch?v=JO_EHceV9sk so any fancy scopes might have been just loaners from $work.
That could have been interesting non-destructive scan with microfractured elements like this drill. They had them at uni. They had a third wire to ground after the test and some strange holding grip to prevent the whole setup from becoming a capacitor. One run took hours and you needed the 3d model of the object and thorough cleaning and sometimes sanding of the surface.