A device that analyzes zombie boss' weakness developed by Dr.A. It will obtain combat data in live to analyze zombie boss' weakness. By possessing this item in your inventory, your damage against bosses will upgrade to a certain level varying on the grade of the item.
Weakness Analysis Device can be obtained randomly by opening Dr. A's Trunk after Zombie Scenario Re:boot. The grades of Weakness Analysis Device acquired varies on the grade of Dr. A's Trunk. For instance, opening Low Grade Dr. A's Trunk will give you a Low Grade Weakness Analysis Device.