Working by "seeing" heat radiation, these can work in total darkness, as long as there is thermal variation in the environment. It also takes a certain amount of training to interpret the images provided by these sights, as they only show heat. A blob of red in your sight's display might be a squad of troopers, a pair of banthas or a landspeeder. Fairly bulky, they are about the size of a macroscope, and can really only be mounted on rifles and large carbines at the low end of the scale. Due to the difficulty is positively identifying your target, they are not in common use anywhere.
(skill: PERCEPTION: Thermal Interpretation (no specializations). Improves normally. Used by those species that do not naturally see IR to figure out what the thermal display they are looking at means. Not very common.)
Armoury