This review features three new handheld rangefinders by Vortex Optics . Eastmans’ Todd Helms breaks down all the features of the Viper HD, Diamondback HD and Crossfire HD rangefinders. These boast features ranging from Armortech coatings, LOS, HCD and Scan modes, up to 7x magnification and OLED displays. There’s a model for every price point and each one comes backed by Vortex’s famous warranty.