The KonuShot 3-9x32mm is affordable and dependable as its metal construction was designed to withstand the most extreme environments. Even altitude changes will not cause your KonuShot to fog leak or lose alignment. The KonuShot has coated optics providing great luminosity and a wide field of view. The 3-12x40mm offers a "Four-Times" zoom ratio not typically found on scopes at this price making it the ideal model for marksmanship as well as hunting. As with all Konus scopes they are nitrogen purged for true waterproof & fogproof integrity as well as being shockproof. Dry Nitrogen Filled Max Internal Adjustment: 6.2 in/1.59m Parallax Setting: 100 Yards Mounting Length: 18.3 in/465mm Coated Optics Metal Construction Konus Lifetime Replacement Warranty Includes: Lens Caps and and Lens Cleaning Cloth