I have locally bought (for 50€) Fluke 87 IV that wouldn't power on.
It looks like it was used a A LOT.
On first inspection i noticed heavily corroded battery terminals (and one broken) which I took out for cleaning.
Dumped in vinegar for an hour:
I will solder a thin layer over contacts to prevent future corrosion. And also need to fix one broken tab.
For the first test of DMM I quickly soldered wires directly to PCB and It seems to work just fine...
Full resolution:
While trying to pry out dial knob, the screen plexiglass cracked, so there is more work to do...