I recently acquired a few HP3478A digital VOM.
Oddly enough, today's common probes won't fit as the receptacles are not designed to accept sleeves around the prong. I know the fix is to cut off the sleeves and that's what I did. Works now.
But does anyone know the history behind this change? Today's multi-meters all use sleeved banana plugs. I see a logic in it that if it should come lose, it won't expose the energized terminals. But when did this change happen? Is there a code/law/regulation that now require this?