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