ATN NVGOPS31530 PS31-3 Night Vision Goggles Matte Black 1x 64-72 Ip/mm, A Grade ResolutionThe PS 31 BNVD has independently pivoting tube housings that allow the operator to run the goggle in a binocular or monocular configuration. Using two tubes at once allows the eyes to create depth perception and increases the ease in maneuvering terrain and obstacles as well as operating devices such as control panels and door knobs. Monocular configurations allow for ease in transitioning between various lighting conditions that often occur on the