The Mini Hover Disc The Hover Disc searches for naturally magnetic material to use in certain types of repairs in case of engine or part malfunction. The disc hovers above the ground in a set direction until it locates an attraction. If the attraction is strong enough, it stops and takes a reading. The indicator light turns green and a strength reading appears on the screen. If the reading is good, the remote can extract the material from the ground, usually in the form of small granules to small pebbles.