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Can someone explain to me for my brother who plays Tau how you scan with the Improved Sensors on the battlesuits? In the codex it only tells about the ability to scan not how far or how it scans.
As it says in the codex, information on finding hidden troops is found in the Catachan and Tyranid codices -- the armies that have units with a hidden deployment.
Basically, during the player's shooting phase any unit may choose to search for hidden units. They may still shoot, of course, but the act of searching requires an explicit announcement from the player. Models that are psychers or that have an Auspex, Improved Sensors that are declared as searching will automatically succeed, but may not shoot.
Just tell your brother to ask to see the other player's codex if he's playing against Tyranids or Catachans. For Tyranids it's under the section for Lictors. It'll explain exactly how searching works.