[dboreham]

I was going to say, like in this : https://xkcd.com/730/

Except even after 10 minutes staring at his circuit diagram, I can't see the "attach scope probe here" so I must have dreamed it.

Back in the day we would muse about selling a "scope probe emulator" device that had the same 10pf capacitance or so, but was much smaller than an actual oscilloscope and could therefore easily be incorporated into a production board. Of course now oscilloscopes are sufficiently small and cheap that you could simply use a real one.