What is a Direct Reading/True Elevation Grade Rod?
  
The Direct Reading or True Elevation (also known as Lenker style) is a grade  rod with a movable tape face allowing you to set the actual benchmark  elevation, or any elevation, above or below the bench into the rod. The  actual true elevation above sea level is read on these rods, thus  eliminating errors caused by adding or subtracting. Since NO math is involved, grade shots are much faster than conventional style  rods. There are 16 different models to choose from!
Aluminum 
  front and rear rods. - Made of high strength clear anodized aluminum 
  for lightweight rugged, dependable operation. They will not rust, split, splinter 
  swell or warp in any environment.
  Tape has heavy duty matte textured mylar face. - Easy on the 
  eyes in bright sunlight. Protects the tape numbers from wear and fading.
  Tape lock grommets are oversized. - Heavy duty brass. Greatly 
  minimizes the problem of tape tearing.
  Detector rail is black, high density, U.V.stabilized for long life. 
  - Specifically designed to not become brittle when exposed to ultraviolet 
  rays or direct sunlight.
  Solid tape lock with internal brake slide. - Stronger, trouble-free 
  operation.
  Tape lock pin cannot puncture tape. - Designed not to tear 
  puncture or rip tape when pushed against tape face instead of the grommet hole.
  DuPont nylon parts.  - Tough and rugged for long-lasting life. 
  Same material used for ski bindings and motorcycle parts.
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