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[[File:Auspex.jpg|right|thumbnail|[[Ultramarine]] [[Space Marine Sergeant|Sergeant]] [[Antaro Chronus]] holding an auspex.]]
'''Scanners''' (or '''multi-scanners''', or '''Auspexes''') are [[Imperial]] short-ranged devices used to detect motion, invisible gases and energy emissions throughout a wide spectrum, such as heat, radiation and most forms of energy given off by vehicles and living troops. Their main tactical use is to reveal otherwise hidden troops and allow them to be fired on. The standard range of a scanner is fifty metres, although walls more than fifty meters metres thick as well as certain shielding materials are able to block them.{{Fn|1}}
Scanners can take the form of separate hand-held devices, or they may be built into a helmet such as in the case of [[Terminator armour]]. The [[Imperial Guard]] uses scanners known as '''surveyors'''. [[Space Marine]]s and other forces use the '''auspex'''.{{Cite This}}