The material below is Open Game Content from a 3PP Source
Lens of Detection
Aura moderate divination; CL 9th
Slot none; Price 3,500 gp; Weight 1 lb.
This circular prism lets its user detect minute details, granting a +5 competence bonus on Perception checks. It also aids in tracking, adding a +5 competence bonus on Survival checks when tracking. The lens is about 6 inches in diameter and set in a frame with a handle.
Requirements Craft Wondrous Item, true seeing; Cost 1,750 gp