In Fortnite, a scanner is a device that is part of the "Nolan Chances Snapshot" Quests. It is found in vaults and allows players to scan the vault room. To deploy a scanner in the vault, players need to make it inside the Eclipsed Estate, Relentless Ridge, or the Abandoned Mansion. It is important to note that the scanner has no other function besides scanning the vault room.
It is worth mentioning that there is also a Recon Scanner in Fortnite, which is a two-round grenade launcher that shoots a scanning projectile. This projectile marks all containers and opponents, including animals. Scanning is a gameplay mechanic introduced in Chapter 2 Season 2 that allows players to see opponents.