Magfield sensor ball/Legends

A magfield sensor ball was an outdated sensory input device utilized with Mark II reactor drone droids and other simple labor droids. The sensor ball was a simple metal ball contained in a wire cage that allowed a droid to "perceive" its surroundings any time the ball hit the cage. This situation was usually encountered when the droid ran into an obstacle or had begun to tip over.
==Sources==
*Star Wars: The Visual Dictionary 
*Star Wars: The Complete Visual Dictionary
*The Complete Star Wars Encyclopedia
Category:Droid sensors
Category:Sensor types