This review features Leupold’s BX-4 Range HD TBR/W 10×42 rangefinding binoculars. These binos boast the optical clarity and durability you expect from Leupold with the convenience of a fast, reliable rangefinder built-in. The system relies on the True Ballistic Range technology for accuracy out to distances of 2400 yards. Todd Helms has been field testing these binos on spring turkey hunts and has not been disappointed.