You'll like this. (For those easily offended, these Ozians drop a few S
bombs.) Watch all of it. The demo with the aluminum block is surprising.

http://hackaday.com/2010/05/05/when-multimeters-go-boom

I once asked a Fluke engineer why their DVMs were so expensive. He said most
of the cost was in protecting the unit from misconnection or high voltages.

I wish Greg Lefebvre were alive to see this. I can hear his raucous
laughter. "Oh, Willie..."

--
"We already know the answers -- we just haven't asked the right
questions." -- Edwin Land