Laserson probe

The Laserson probe was a tool used for the modification or repair of just about any form of electronic technology, or if the need arose a weapon as well. It was both very powerful and very precisely summed up in one phase: "It can punch a fist-hole in six-inch armour plate or take the crystals from a snowflake one by one". Taren Capel used it to modify the Sandminer robots to kill, to try and burn out the Fourth Doctor's brain, and the Doctor then used it as a weapon against the robots. (DW: The Robots of Death)