SWFA SS 10x42 Tactical Riflescope Mil-Dot Reticle 1/4 MOA Adjustments Rear Focus SS10X42 Matte Black Finish, 30mm Tube, Rear parallax Adjustment Exposed finger adjustable turrets with 15 MOA per revolution In sub-zero temperatures or searing desert heat (-50 degrees to +130 degrees Fahrenheit, and altitudes of 30,000 feet to depths of 15 feet in salt water) the waterproof, shockproof, fogproof SS performs. Made of lightweight aluminum but strong as steel, it has superior multicoated optics for maximum light transmission. Built to NATO specs