HD Optical System delivers exceptional resolution, cut chromatic aberration, and provide outstanding color fidelity, edge-to-edge sharpness and light transmission; Red TOLED Display is optimized for low light; Increment Display - .1 yd increments out to 999.9 yards; Scan displays continuous distance readings while panning across a landscape; XR Lens Coatings provide superior light transmission for exceptional clarity and low-light performance; Diopter adjusts for differences in a user's eyes. Located on right eyepiece; ArmorTek - ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil, and dirt; Waterproof - O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments; Ranging Format - range in yards or meters