text: 1. The vertical tube can be used for 
   instructional viewing or to 
  
  photograph 
  digital camera or 
  unit. 
  2. Loosen the retention screw, then rotate 
   the adjustment ring to change the 
  
   the image witrh a 
   micro TV 
  
   length of the vertical tube. 
  3. Make sure that both the images in 
  
  **13**