The Starrett 98-6 precision machinists’ level is six inches long and has a graduation (also called sensitivity) of 0.42 mm/m, or 80-90 seconds. The level has two vials to provide accurate results. The main vial is ground and graduated with five lines and adjustable to a positive setting. A second cross-test vial allows measurements from two directions at once. An involute groove runs the entire length of the level base, and provides a reliable seat for round work, such as leveling pipes or shafting. The base is made of machined cast iron for increased durability, and the glass vial is housed in a brass tube with a friction-fit closing, to prevent breakage. The level is warrantied for one year.
|Dimensions ||3 x 6 x 1-1/2 inches (H x W x D) |
|Graduation ||0.42 mm/m; 80-90 seconds |
|Number of vials ||2, level |
|Vial material ||ground glass |
H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.
Levels are instruments that are used to determine the true horizontal or vertical plane of a surface. The most common type of level is the spirit level, or bubble level. Spirit levels have a liquid-filled, bowed tube (also called a vial) with a bubble that moves when slight adjustments are made to the level. When the bubble settles between marked points on the vial, it indicates that a surface is horizontally or vertically straight. Levels can have one or more vials to determine the horizontal plane, the vertical plane, or various points between, such as a 45-degree angle, simultaneously. Some levels include a laser line indicator that projects a horizontal or vertical beam on a surface. Bullseye levels, or surface levels, are circular, flat-bottomed spirit levels that determine whether a surface plane is level. Machinists’ levels are made of metal and have surfaces designed specifically for rugged use in a machine shop or tool room. Levels can range from highly-complex and accurate machines, such as those used in the surveying and construction industry, to precision instruments used in carpentry and other building trades, to simple, pocket-sized devices for do-it-yourself projects.
The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.
The Starrett 6-Inch Precision Machinist's Level has ground and graduated main vials and includes a cross test vial. The base of the level features an involute groove running the length of the base that provides a reliable seat for round work. The 6-inch main level vials have gradations that are approximately 80-90 seconds or .005 inches per foot. The level comes backed with a 1-year manufacturer's warranty.