AGM NVG-40 3AW1 Gen 3 Auto-Gated Lvl 1 White Phosphor IIT Dual Tube Night Vision Goggle/Binocular 14NV4123414111. AGMs NVG-40 Night Vision Goggles are an ideal addition to any nighttime hunting or tactical setup. The core of the NVG-40 is an 3AW1 Gen 3 Green Phosphor IIT one of the best image intensifier tubes offered by AGM with a very limited number of spots in zone 1. Image quality is further enhanced thanks to an auto-gated feature, which helps maintain a clear visual while under infrequent and sudden changes in light and the manual gain control can be used to adjust the brightness ...