Burris Fullfield E1 Scope, 3X-9X-50mm Trajectory-compensating technology and cascading dots to compensate for wind drift Finger-adjustable windage and elevation turrets create a sleek profile Turret indications always reflect a change in the point of impact, for pinpoint accuracy Nitrogen-filled scope tubes prevent internal fogging, even in cold and rain Waterproof. Durable, stress-free, solid 1-piece outer tube withstands shock and vibrations of even the heaviest-recoiling calibers