SRD:Rod of Negation
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Negation: This device negates the spell or spell-like function or functions of magic items. The wielder points the rod at the magic item, and a pale gray beam shoots forth to touch the target device, attacking as a ray (a ranged touch attack). The ray functions as a greater dispel magic spell, except it only affects magic items. To negate instantaneous effects from an item, the rod wielder needs to have used a ready action. The dispel check uses the rod’s caster level (15th). The target item gets no saving throw, although the rod can’t negate artifacts (even minor artifacts). The rod can function three times per day.