AdirPro 8' Fiberglass Rectangular Leveling Rods ft/10ths Option of Feet/Tenths or Feet/Eighths, Top section has a 5/8 x 11 female thread for attaching a mini prism. Non-Conductive Fiberglass, Rectangular Shape, Scale on Back Allowing Overall Height Reading Three Adjustable Sections, Locking Buttons Perfect for Laser Detector, Wear-Resistant Scales Water-Resistant and Corrosion-Resistant