Micro-resonator
A micro-resonator was a tool used 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 a  transporter room 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. ()

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Engineering tools