Granite square
STARRETT
Three-Face Granite Tri-Squares provide an excellent, economical way for accurately checking the X-Y-Z axes on CNC machine tools and coordinate measuring machines
Lying in the horizontal position, the X and Y axes can be checked for 90º squareness With the square in the vertical position, tracing along the vertical edge of the square can check the perpendicularity of the Z axis
Granite tri-squares may also be used in the same manner that steel squares would be used for the direct checking of squareness and straightness
