Night Optics USA distributes a wide variety of tools and accessories for night vision systems. The Day/Night adapter is a nifty sub-$300 gadget that allows an operator to mount a PVS-14 monocular behind his or her rifle optics, converting it into a night-vision sight. To use the rifle optics in daylight, all an operator has to do is flip the PVS-14 out of the way. Another useful accessory offered by Night Optics is the NO/NVG-23 Stereoscopic Goggle/Binocular. This inexpensive device allows the user to take two Mini-14 monoculars and convert them into a binocular system for driving and other operations that require depth perception.