Steiner mil-spec binoculars and scopes are designed for true battle-field conditions. Rugged lens construction ensures stability even under severe shock and vibration. Unbreakable Makron® binocular housings with stand oils, solvents, heat, cold, sun and saltwater. One-piece nitrogen pressurized 34mm scope tubes are shockproof to 900 Gs. All optics are fog-proof and waterproof, sealed against dust, dirt and moisture. All are immersion waterproof, some to depths of 33 feet. Designed with special forces and expert weaponry input, built to strict milspec demands, Steiner optics exceed the need.