A transient saber that was sacrificed to demonstate the cutting power of assembly line machinery.
God, I hate how unpersonalized and replaceable lightsabers were treated in the PT. Obi-Wan goes through two (or three, if you count Qui-Gon's weapon) before finally getting his signature lightsaber from SW in ROTS (And even then, it's not a film-accurate replica of the SW saber.).