Operating  Controls  and  Indicators  (cont.) Index Control,  Indicator, Function No. or Connector 6 Signal  Meter Indicates  average  return signal level used to peak instrument on target. 7 Numerical  Display 8-digit liquid-crystal display, Indicates range in meters, 8 Night Illumination When in UP position Switch illuminates front panel  for night  operation 9 Zoom Adjustment Provides  sighting telescope  adjustments from 3 to 9 power. 10 Vertical  Cross-hair Provides vertical Adjustment adjustment for boresighting  telescope. 11 Horizontal Cross-hair Provides horizontal Adjustment adjustment for boresighting  telescope. 12 Cal/Start Initiates calibration se- quence to adjust return signal to normal operating level when in aim mode; in itiates a new range se- quence when in range mode. 13 14 15 16 17 18 19 20 PPM Switch Vertical Lock Aim  Lamp Ready  Lamp Twc Speed Vertical Tangent Screw Aim/Range Horizontal  Lock Two  Speed Horizontal Tangent Screw TM 5-6675-330-12&P Used to enter barometric and temperature correc- tions into instrument t99ppm  For securing vertical ad- justment ON in aim mode. When  ON  ,  calibration sequence has been completed and return signal is in the optimum range  to  measure For coarse and fine vernier vertical adjustment to achieve maximum target acquisition. Alternate action pusn- button switch; aim mode is used for target acquisition and return signal level ad justment; mode is  used for ranging, For securing horizontal ad- justment. For coarse and fine vernier horizontal adjustment to achieve maximum target acquisition. 9