I was looking to measure the voltage across a buck converter’s sense resistor to monitor the current. I have a 700V Diff Probe (and very good it is too) but it was too big for the job of this low voltage
A basic tool that was designed as a spate of shorted boards came in - not our usual supplier I have to admit.
I needed to find the short that was on the board, it was on a power rail so it had a few taps
It's a bit of a long stretch to call this a scope but, when I was young ( A long time ago and Valves) we used to use an audio amp to listen to the buzz on TVs. We could hear the frame buzz