Granite surface plates
Granite squares
Granite master squares 
Granite vee blocks
Granite parallels and straightedges
Granite components
Measuring stands
Air Bearing Linear Slides
Air Bearings
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Granite Master Squares
Master squares enjoying self-checking ability, are widely used for accurately checking the X-Y-Z axes on almost all machines/tools and coordinate measuring machines.
With a side surface lying in the horizontal position and an indicator in the spindle, the X and Y axes can be checked for 90 degrees squareness. With the square standing in a vertical position, by an indicator tracing along the vertical edge of the square, the perpendicularity of Z axis can be checked conveniently. And by tracing along the top edge of the square, it will check the parallelism of the table in the X and Y axes to the spindle.
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