Micro-Resonator

A Micro-resonator.

A micro-resonator is a tool used by Starfleet engineers to degauss relatively small devices. For larger objects, a magneton scanner could accomplish the same task.

In 2371, as part of a crash course in Starfleet training, Tuvok had Crewman Chell degauss the transporter pad with a micro-resonator to learn "patience". Tuvok estimated it would take approximately 26.3 hours to complete; Torres stated that the magneton scanner would take five minutes.(VOY: "Learning Curve")

The writers intended using the micro-resonator instead of the magneton scanner for this chore to be the 24th century equivalent of using "a toothbrush to clean a floor."