Some of the devices were recovered on Coruscant by Wedge Antilles, and Luke Skywalker later used the devices in his efforts to find candidates for his Jedi Praxeum at Yavin 4. Dark Jedi Brakiss stole a few of the devices and used them to discover potential students for his Shadow Academy. Luke later disdained their use, although it is known that Kyp Durron used one to test his Padawan Miko Reglia.
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