The Sightmark Triple Duty Series and Tactical Series of riflescopes use cutting edge glass and lens coatings to ensure that it is the most accurate riflescope in its class. Precision multicoated optics are a distinguishing feature of the Sightmark Triple Duty riflescope line; multicoated lenses offer a clear view for easy target acquisition in both bright and low light situations. Both waterproof and fog proof, the nitrogen filled Sightmark Triple Duty Series features oversized windage, elevation and parallax adjustment knobs for easy adjustment in the field. Locking mechanisms on the windage and elevation adjustments ensure that the scope stays zeroed. Internal lit Mil-Dot reticles help shooters successfully make accurate shots over a wide range of distances and lighting conditions.