[[File:Auspex.jpg|right|thumbnail|[[Ultramarine]] [[Space Marine Sergeant|Sergeant]] [[Antaro Chronus]] holding an auspex.{{Fn|13}}]]'''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.{{Fn|1}}{{Fn|15}}

[[File:Niklas-eneqvist-auspex.jpg|thumb|right|250px|A handheld auspex scanner.{{Fn|14}}]]Auspex scanners are a standard tool of many Imperial agents and warriors. It is easy to use and invaluable when scouting or investigating unfamiliar terrain.{{Fn|15}} Their main tactical use is to reveal otherwise hidden troops and allow them to be fired on. The standard range of a handheld scanner is fifty,{{Fn|1}} five hundred,{{Fn|8}} or fifteen hundred metres,{{Fn|9}} although walls more than fifty centimetres thick as well as certain shielding materials are able to block them.{{Fn|1}} Longer-range, bulky, auspexes have, depending on craftmanship, a range of five or ten kilometres and can penetrate walls up to a metre thick.{{Fn|6a}} Ground vehicle-mounted auspexes can have a range of fifty kilometres.{{Fn|6b}} Aircraft-mounted auspexes can have a range of a hundred kilometres.{{Fn|11}}

Scanners can take the form of separate hand-held viewscreen devices, or they may be built into a helmet such as in the case of [[Terminator armour]].{{Fn|7}} The [[Imperial Guard]] uses scanners known as '''surveyors'''. [[Space Marine]]s and other forces use the '''auspex'''.{{Cite This}}

*{{Endn|11}}: [[Double Eagle (Novel)]], Day 253 — ‘''Over the Makanites. 12.01’’01''*{{Endn|12}}: [[Liber Astartes(2nd Edition)]], pg.142:**{{Endn|12a}}: pg.142**{{Endn|12b}}: pg.146143*{{Endn|13}}: [[Codex: Space Marines (5th Edition)]], pg.122*{{Endn|14}}: [[Warhammer 40,000: Darktide]]*{{Endn|15}}: [[Imperium Maledictum: Core Rulebook]], pgs. 145 & 147