Voltmeter (aka multimeter): Device used to test the voltage of dead batteries; it normally has dead batteries itself.
"it normally has dead batteries itself"
I always have at least one 6 pack of 9v batteries in my truck boxes for just such occurances.
Crap like that is why my truck boxes and contents weigh 1500#
2 cross boxes and 2 side boxes crammed full and the tool that you want is always on the bottom!
True voltmeters don't use batteries, they are galvanometers; ohmmeters need batteries.
Unfortunately, digital meters need batteries just to say hello.