The SVR 98011 25′ SVR (inches)heavy-duty level grade rod is constructed of strong reinforced fiberglass and its rectangular-oval shape is designed for the serious user. Scales are glare resistant and protected by an abrasion resistant coating. A special measuring scale on the backside permit users to read height at eye level. The tight locking mechanism features round buttons that resist jamming from sand and dirt. The top of the rod has a female 1/4″ x 20 thread for attaching accessories. The SVR has a rectangular-oval shape, and is flat on the front and back with round corners. This convenient shape prevents the scale from rolling, making observation much easier. The rod is also water-proof, corrosion-resistant, and non-conductive.