Ls starrett 10" plumber's level w/ adjustable incline

What is for sale: Ls starrett 10" plumber's level w/ adjustable incline

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Specially designed for engineers, plumbers, and other mechanics, Starrett No. 133 Levels combine three-uses-in-one with their 3-level feature – a fixed level, a plumb, and an adjustable incline level.
Both the main level and incline level vials can be read from the side and the top.
The incline level tube has a hinged mounting inside the level frame. After placing the level on any inclined surface it is adjusted to the "level" position. The degree of incline is then indicated by the pointer at the end of the level tube and read off a graduated plate.
The Inch reading plate is graduated in 1/16" per foot (1.6 mm per 300 mm) and reads up to 2" per foot (50 mm per 300 mm) incline.
Millimeter reading plates are graduated in millimeters per 250 mm and read up to 40 mm per 250 mm incline.
The base of the levels have an involute groove running the full length, which provides a reliable seat for round work
Please email with any questions, thanks.