The material below is Open Game Content from a 3PP Source
Lantern of Revealing
Aura faint evocation; CL 5th
Slot none; Price 30,000 gp; Weight 2 lbs.
This lantern operates as a normal hooded lantern. While it is lit, it also reveals all invisible creatures and objects within 25 feet of it, just like the spell invisibility purge.
Requirements Craft Wondrous Item, invisibility purge; Cost 15,000 gp