The brief look inside was quite interesting, and promising.
Anyhow, I missed further teardown details, schematics, specifications, as you usually do in your other great RF videos.
It would have been much better to settle the Keithley 7510 on top of the Valhalla calibrator, so both instruments were visible, and the audience could actually follow calibrator settings versus DMM readings.
It was a pity, that the calibration process was not transparent.
The calibrator needs 10 sec to settle to each new setting, so mostly each measurement was too fast.
Also, before this cal process, a brief look into the 7510 specifications and date of last cal would have been very useful, to determine, if the 7510 really is capable of doing that calibration properly, in terms of uncertainty and stability.
For 100V and 1kV range, probably this mysterious Keithley version of the "autocal" feature would have been necessary to apply before calibrating these ranges.
I'd like to see a follow up under this aspect, maybe also adding the current source capability.
Frank