Biometric sensor array
From The Stargate Omnipedia
Console removed from storage in Atlantis, designed to detect life signs inside the city's perimeter. The device can be an early warning system if Wraith life signs are detected.
KEY EPISODE
Sanctuary - Dr. Grodin announces that a biometric sensor array has been pulled from storage, and is surprised to discover Chaya Sar activating it by a simple touch.