Athlon Second-Focal-Plane 3-9x40 Riflescope

From the Amazon Listing

• Fully Multicoated optics effectively reduces reflected light and increases the transmission of light giving you a brighter image than normal single coated lenses
• Heat treated one piece tube gives the scope extra strength over multi-piece tubes. A one piece tube also is better at keeping moisture out thus keeping your scope fog proof for the life of the product
• Aircraft Grade Aluminum provide extra strength and durability to handle the toughest terrain and offers lifetime of use.
• Waterproof to protect the scope in the harshest weather conditions or if accidentally submerged underwater
• Robust mechanical system with special designs on both control and erector system that give you the ultimate recoil resistance to withstand 1000G recoil for 1000 times.