Phase compensator

From Memory Alpha, the free Star Trek reference

A phase compensator can refer to an engineering tool or a component on Federation starships such as the Intrepid-class.

During the USS Voyager's maintenance overhaul in 2377, Lieutenant B'Elanna Torres ordered that a new phase compensator be installed on a relay. (VOY: "Nightingale")

Later that year, when Voyager was trapped in the Void, Captain Kathryn Janeway inadvertantly gave Seven of Nine's favorite phase compensator to the Nygeans, so that they could repair their sensor array. (VOY: "The Void")