Tester Zero

Tester Zero (テスター・ゼロ) is a weapon that can be used by Vexen in Kingdom Hearts 358/2 Days. It is Vexen's basic weapon, and therefore requires no Gears to be attached to him in order to wield it. In appearance, Tester Zero is almost entirely gray, symbolizing that it is the most basic of all of Vexen's weapons through the use of achromatic colors.