Sensor

Dalek casings were equipped with sensors, including the sensor grille, also known as sensor mesh, (PROSE: Prisoner of the Daleks, Engines of War) sensor plates, (TV: Planet of the Daleks) optical sensors, aural sensors, sensor globes or sensor pods. (PROSE: Remembrance of the Daleks) K9 models possessed olfactory sensors. (TV: The Gift, The Eclipse of the Korven) In a parallel universe, the Starfleet vessel USS Enterprise (NCC-1701-D) possessed visual sensors. (COMIC: Assimilation²)
Dorothy McShane had sensors taped to her forehead and chest when she underwent a full medical examination to be a passenger on the Virgil. (PROSE: At Childhood's End)
The door to the cold storage in the Vault had a sensor to open it. (PROSE: A Worthy Successor)