Starrett 98-6 6-Inch Precision Machinists Level Precision machinists level with a graduation of 0.42 mm/m, or 80-90 seconds Ground glass main vial is graduated, and adjustable to a positive setting, for accurate results Cross-test vial enables simultaneous leveling in two directions for precise measurements Involute groove along the base provides reliable seating when leveling round items Cast iron base for increased durability Accurate and reliable machinist's level Cross test vial allows simultaneous leveling in both directions Ground and gradated main vial Made from high-quality seasoned cast iron 1-year manufacturer's warranty