Opfor Night Solutions Photonis Echo White Phosphor PVS-14Photonis Echo White Phosphor PVS 14 Photonis Echo tubes offer great value for the price, especially with their white phosphor offerings. The PVS 14 is the standard monocular housing used by militaries around the world. 1600 2000 FoM Photonis Echo Autogated image intensifier White phosphor for reduced eye strain and better perceived contrast Durable housing made by Optronics Engineering Optronics Engineering Ocular Lens, ADI Trident Low Profile Coated