Pitch/Slope Locator Scale Half Printed 0 to 90 Degrees In 2 Quadrants Other Half for Reading Pitch in in Rise Per 12 in Run Lens Diameter 5 3/8 in Black High Impact Plastic Body Acrylic Lens V-groove for Pipe/Conduit Work For Carpentry Plumbing Electrical HVAC work Requiring Accurate Pitch or Slope Such As Roof Pitch Stair Slope or Drainage Angles