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Product Description
The Starrett 98Z-12 precision machinists’ level is a 12" long spirit level with a graduated main vial that has a sensitivity of 0.42 mm/m or 80 to 90 seconds for determining horizontal plane, a cross-test vial that enables simultaneous leveling in two directions, and a plumb vial for determining vertical plane. The main vial is adjustable to a positive setting for accurate results, is made of ground glass that resists scratching to provide clear readings, and is housed in a brass tube with a friction-fit closing to resist breakage. A V-shaped groove along the base provides reliable seating when leveling round items such as pipe, conduit, and shafts. The level has a cast iron base for durability and it comes with a finished wood storage case. Levels are used in the building trades, engineering, surveying, and metalworking, among other applications. 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, founded in 1880, is headquartered in Athol, MA.
Amazon.com Review
The common and sensible dictum among carpenters--"Measure twice, cut once"--is only the beginning for Carroll, who manages to take some very complex information and distill it into readable and understandable form. There are chapters devoted to laying out foundations, frames, roofs, stairs, masonry units, and finishing materials, and many little-known tricks of the trade and shortcuts. Carroll covers all the basics of tools and techniques, shows how to measure larger dimensions on projects while working alone, and shows that one needn't be a master mathematician to assure accuracy in projects, nor use space-age, high-tech equipment to achieve near-perfect results in a building project. From the simplest how-to project for a home handyperson to constructing an entire house, proper, accurate measurements are the very foundation of a successful result. Using common sense and care in measuring can save time, materials, and money on any home repair or construction plan. This is the book to tell you everything you need to know before you get started. --Mark A. Hetts
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