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Subcommander T'Pol utilizing her viewer in 2154.
In the 22nd and 23rd centuries, a viewer emanating blue light could often be found on the bridge of a Starfleet, or Earth Starfleet, starship. The viewer was an instrument that was used by science officers to scan and analyse planets, spatial phenomena and other vessels.
In the mid-22nd century, T'Pol used a viewer aboard the NX class starship Enterprise. (Star Trek: Enterprise)
Later, Spock used another viewer on the bridge of the Constitution-class Enterprise. (Star Trek: The Original Series)
Although no canonical name for this instrument has ever been revealed in a Star Trek episode, this device was referred to as a viewer in script sources. The scientific instrument has been the subject of many parodies, particularly of The Original Series.