When visual clarity and cost matter, the BushnellPrime 3-9x40mm Rifle Scope are your answer. Multi-coated optics create crisp, bright images with outstanding color resolution and contrast under all light conditions. XTR Technology improves light transmission to 90% with 60 layers of coatings on each prism. Ultra Wide Bandcoating customizes the anti-reflection coating on each lens element in the optical path. EXO Barrier lens coating repels water, oil, dust, and fingerprints and will not fade over time. T6 aircraft-quality 1 inch aluminum tube surrounds the lens and is gas purged for fogproof performance. About the Bushnell Ballistics App The Bushnell Ballistics App, is a companion app to use with your Bushnell Scopes to calculate firing solutions. This app allows you to use current atmospherics to calculate the hold overs in your reticle using the AB Ultralite Engine. With this app you can build and modify gun profiles. You can build range cards and calculate firing solutions based on your scope and ammunition. The app has a multi-target function with 5 custom ranges. You can store up to 5 gun profiles. Range Cards can be emailed to yourself, or a friend. This app is free from Bushnell and works on both Android and iOS operating systems. Go to website: http://appliedballisticsllc.com/products/apps/bushnell-ballistics/ Fully multi-coated with exclusive XTR technology to utilize 60 layers of coating on each prism to conserve, harness and optimize available light Ultra Wide Bandcoating anti-reflection enables maximum brightness and true color to travel from the front glass back to the eyepiece T-6 aluminum tube construction is gas purged to remain waterproof, fogproof and shockproof Side parallax adjustment allows correction without needing to remove your eyes from the target EXO Barrier coating fills-in any microscopic pores to repel water, oil, dust and fingerprints and will not fade with normal wear and tear Backed by the Bushnell Ironcl