Suunto clinometers can be used to measure heights of trees, towers, buildings, etc.; to measure slopes for grading or preliminary surveying; and to measure vertical angles for cellular and satellite installations and more.All Suunto clinometers feature a solid aluminum housing with jeweled bearing assembly. Damped scale for smooth, accurate readings. Parallax-free lens. 1/4" x 20 threaded tripod socket. Includes lanyard and black nylon case.?35m @ 15m baseline, ?50m @ 20m baseline, respectively. 20m scale/degree conversions on back.