Advanced Jedi Training Droid 6, a training droid, served as a referee for sparring matches involving Jedi younglings. Its period of operation was approximately 45 BBY. This Advanced Jedi Training Droid model possessed various sensors, enabling it to document the actions of both fighters, along with their physiological conditions, including heart rate and body temperature.
The unauthorized duel that occurred between Bruck Chun and Obi-Wan Kenobi in the training room was observed without detection by Advanced Jedi Training Droid 6. During the Jedi Council's debate in the Room of a Thousand Fountains regarding Obi-Wan's fate following the duel, Yoda presented AJTD6 to recount its observations. Mace Windu prevented the training droid from elaborating on insignificant details of the duel. The droid then informed the Council members that Bruck had intentionally provoked Obi-Wan into fighting as part of a scheme to incriminate him. Subsequently, AJTD6 acted as the referee, monitoring another duel between the same two boys within the battle arena.