text: Illumination 
  Controls 
  **Model AY11230**
  
  **MICROSCOPE USAGE**
  
  BARSKA Model AY11230 and Model AY11234 are trinocular 
  microscopes designed for biological studies such as specimen 
  examination. They can also be used for examining bacteria and for 
  general clinical and medical studies. Simple design and use and the 
  vertical tube make them is useful for school classroom instruction. 
  
  **CONSTRUCTION**
  
  BARSKA Model AY11230 is a fixed power trinocular stereo 
  microscope. It is constructed with two optical paths at the same 
  angle. It is equipped with transmitted illumination and oblique 
  illumination. By using this instrument, the user can observe and 
  enlarge the right side stereo image. BARSKA Model AY11234 is a 
  zoom trinocular stereo microscope. The object being viewed is 
  enlarged through two identical sized sets of right and left eye 
  lenses. The zoom provides different magnification and features an 
  inversion system which allows the image to be viewed normally 
  and right side up. 
  
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