Microwave fires a straight white ray with very high accuracy and impact. It has the highest rate of fire in the entire game, but also it has a very short range like all Elementals. It is a unique elemental weapon because it doesn't have any element, so it can't affect enemies with status effects. (it shouldn't really be called elemental) However, it has the highest damage.
The range can be increased with Advanced Rifling. Microwave is the easiest Elemental to use, because it's spray has high accuracy and it doesn't split into multiple directions when firing, making it easier to control and harder to kill yourself.