Tube is 5 1/8" long. 1 1/8" radius arc is graduated in degrees - 0-90° in both directions with vernier readings to 10 minutes. Slope scale 1:1 to 1:10. Belt loop Cordura® case. 301-045 Abney Level 0.5 lb. Same as above but with arc graduated 0-90° in both directions and a percent-of-grade scale from 0-100%