Electromagnetic Synthemometer
From Star Trek : Freedom's Wiki
An electromagnetic synthemometer was a diagnostic device from the mid-24th century. This hand tool measured the rate of electromagnetic activity of a mechanical device. Ratings were either positive or negative with positive being a good result.
In 2364, a technician aboard the USS Enterprise-D was using this tool in the re-assembly of Lore. (TNG: "Datalore")
