From Pathfinder Adventure: Malevolence, which isn't enabled.

Starless Scope Lens

ITEM 9

Price 100 gp

Usage held in 1 hand

Bulk —

A replacement lens for a Starless Scope. If you know the formula for the starless scope, you can Craft a new lens with a DC 25 Crafting (master) check.

Activate Interact (manipulate); You can replace a broken lens in a starless scope with an undamaged one.

Pathfinder Adventure: MalevolenceOGL