Abney Level Measures Slope Values by Arc and Grade
Unique Abney Level determines slope values by means of arc measure and grade percentage. Perfect for surveyors, engineers and foresters. Features a 5-1/8"L tube. Its 1-1/8" radius arc is graduated in degrees from 0–90º in both directions with vernier readings to 10 minutes. Slope scale 1:1 to 1:10. Includes belt-loop Cordura® case.