Per micky:
So at most, if unplugged, not especially this device, it could have less
than 12 volts in a capacitor and it can't hurt you, but others here
could tell you if a 12 volt cap could discharge through an ohmmeter and
damage it. But I'm sure there are no big caps on this board.

I'll start in on the cold/cracked joint inspection next.

I have no clue what constitutes a big cap but, FWIW, this cam is
designed to run for a certain period of time after the 12v external
power has been removed - and they do that by using 2 capacitors instead
of a rechargeable battery. Each capacitor is about 3/4" long and 5/16"
in diameter. This is supposedly a higher-end feature because the caps
will not wear out like rechargeable batteries will.
--
Pete Cresswell