The Durational Spectrometer displays the afterimage of anything that has been in an area in the previous five hours. It produces an image clear enough to read a person's lips, but creates otherwise fuzzy reproductions of human subjects, giving them a ghostly appearance. The Spectrometer does not record images for later playback, and need not have been present at the time that those images actually occurred.
Warehouse Personnel use the Spectrometer as a security camera.
- Before the Spectrometer was invented, Warehouse 9 had a similar artifact, a large mirror that when a lit candle is held up against it the mirror shows what happened in that spot hours ago.