Advanced Jedi Training Droid 6 was a training droid used to referee sparring matches between Jedi younglings. It was in use around 45 BBY. The Advanced Jedi Training Droid model had a number of sensors that allowed it to record not only the actions of the two combatants, but also their physiological state, such as body temperature and heart rate.
Advanced Jedi Training Droid 6 was an undetected observer to the unauthorized duel between Bruck Chun and Obi-Wan Kenobi in the training room. When the senior members of the Jedi Council were arguing in the Room of a Thousand Fountains about what to do with Obi-Wan in light of the duel, Yoda brought AJTD6 to describe the events that it saw. Mace Windu stopped the training droid from spending extra time describing minor details about the duel, and the droid told the Council members that Bruck provoked Obi-Wan to fight in order to frame him. AJTD6 would later monitor another duel between the two boys in the battle arena, this time as the a referee.
- Jedi Apprentice: The Rising Force (First appearance)