I used a multimeter in its 600 V AC range to measure the voltage across a socket of a surge protector that is rated 125 V - 5A.
As soon as I inserted the test leads, there was a pop and a bright flash.
The outlet is unharmed but the black probe tip has been damaged slightly and the multimeter fuse has blown.
What could have happened?
EDIT: The multimeter is a commercial electric MMM 8301s. I set the red test lead to the 10a slot and the black on to the com slot. The multimeter was set to 600 volts AC, but the outlet seemed to be a DC one. I plugged the black lead to the top left outlet and the red one to the top right one. What happened?