A coil scanner is a type of hand-held sensor which was used by Starfleet in the 24th century.

In 2372, the crew of the USS Voyager used a coil scanner to search for a transporter module which had been stolen by Seska. (VOY episode: "Maneuvers")

When Kes was suffering with the aftereffects of her possession by the Ilari warlord, Tieran, Kes went to B'Elanna Torres and asked her about self-control. Torres claimed that she had to practise self-control at work in main engineering because she couldn't "just go belting every ensign who drops a coil scanner and makes me realign it". (VOY short story: "Winds of Change")