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}} VehicleGround vehicle-mounted auspexes can have a range of fifty kilometres.{{Fn|6b}} Auspexes mounted on spaceships can easily scan the orbit and surface of a planet from the edge of a system at the [[Mandeville Point|Mandeville point]], the collected data visually represented with the help of a [[Hololithic Projector|hololithic projector]]{{Fn|10a}} or [[pict|pict screens]],{{Fn|10b}} after being processed by [[cogitator]]s and [[servitor|mono-task servitors]].{{Fn|10a}}