The Verifier has a lens in it similar to those found in reading glasses. Allows you to see your sight pins better on your hunting sight. Podium Peep Lenses require the use of a Podium Peep Aperture to secure the lens into the Podium Peep housing. Podium Peep Apertures, Podium Peep Clarifiers, and Podium Peep Verifiers fit into Specialty Archery Podium Peep ONLY. NOT compatible with other Specialty Archery peeps.