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             A 
              laser level is a type of measuring tool used to help define and 
              mark a level surface over long distances. A laser level works in 
              a manner similar to a spirit level, except whereas a spirit level 
              can only measure a level surface over the distance of the level 
              itself, a laser level can measure over the entire length of the 
              laser beam.  
               
              Laser levels are frequently used in conjunction with a tripod to 
              ensure the device is completely stable. 
              
               
             
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