Object

Effects that deal damage generally affect unattended objects normally but don’t damage held or attended objects unless the effect specifies that they do. Effects that do something other than deal damage affect objects only if their descriptions specifically say so (this is common only with spells) or if they note “(object)” in the description of the effect’s saving throw. An object’s total saving throw bonus for Fortitude, Reflex, and Will saves is equal to the object’s item level (see page 167). An object you’re holding or wearing uses your saving throw bonus if it is better than the object’s own saving throw bonus. Items with an item level of 0 do not receive saving throws when unattended.

Source

Core Rulebook pg. 242

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