SitePro Topographic Abney Level – 6-1/4 in The SitePro Topographic Abney Level is a compact, precision optical instrument designed for measuring slope, grade, and elevation differences in surveying, construction, and earthworks applications. Featuring a 6-1/4 in (16.1 cm) square sighting tube with internal focusing telescope , this hand level delivers clear, accurate readings for field professionals requiring reliable gradient measurement. Built for versatility, the instrument includes dual interchangeable arcs —one graduated in degrees and percent grade, and another in topographic scale—allowing users to quickly adapt between general grading and contour work. Ideal for topographic surveys, excavation, trenching, and site preparation , it provides a dependable solution for measuring slopes and establishing vertical control in the field. Key Features 6-1/4 in square sighting tube with internal focusing telescope Dual interchangeable arcs (degrees/percent grade and topographic scale) Measures 0°–60° and percent grade for flexible applications Durable brass construction for long-term field use Includes belt loop carrying case for portability