GPO RANGEGUIDE BINOCULAR BLACK 8X50 3000 YD. W/ ANGLE COMPENSATION The Rangeguide brings two worlds together; premium optics and long-range range finder with True-Range Angle Technology. Other features include a 50mm objective lens for optimal light gathering, 3,000+ yard ranging, scan mode, temperature reading, rubber-coated magnesium body, and backed by a lifetime warranty.