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| Starrett >> Levels, Transits, Plumb Bobs |
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| No. 98 Series Machinists' Levels with ground and graduated vials These levels have ground and graduated main vials. All sizes have a cross test vial except the 4" (100 mm) model. The 12" (300 mm) model also has a plumb vial and the 18" (450 mm) size has a double plumb vial. These vials are adjustable to a positive setting and are housed in a satin finished brass tube with a friction-fit closing cover to prevent breakage. |
Top: model 98-12, Bottom: model 98-6 Click here for bigger image. |
The base of the levels features an involute groove running the length of the base, which provides a reliable seat for round work such as pipes or shafting. With the cross test vial, it is possible to simultaneously level in both directions. This prevents inaccuracies in the main vial reading caused by canting the level sidewise on round work. The 6" through 18" (150-450 mm) main level vials have graduations that are approximately 80-90 seconds or .005" per foot (0.42 mm per meter). There are five, six, or seven lines on each side of the bubble, depending on the base length. Packed one in a box. |
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