Microwave Emitter

The  is a unique Mesmetron added to Fallout 3 in the Point Lookout add-on. It can be repaired with Mesmetrons.

Obtaining
The Microwave Emitter is found in the reward vault at the end of the quest A Meeting of the Minds. It seems to do more damage if the shot hits a enemys head and causing head cripple instantly. (speculation, needs confiramtion.)