"CORRECTED DETECTOR TO PROVIDE REAL TIME ACTIVE MONOTORING OF LIGHTING LEVEL, AN ILLUMINATED USAF1951 BAR TARGET ON AND ADJESTABLE MOUNTING STAND, NVG VISUAL ACUITY CHECK PERFORMED WITH THE LM-33-500 VIRTUALLY, GROUP -6 TO GROUP -1,CONFIGURED VIEWING AT 15 FT TO 20 FT, VISIBLE SKY RADIANCE LEVELS, TARGET ADJUSTMENT HEIGHT 91 INCHES TO 115 INCHES FLOOR TO CENTER,"