Versatile design lets architects work quickly with maximum efficiency. Change units quickly and easily by rotating dial at either end of scale—no need to move the scale from the work surface. 12" measuring length, exact calibrations; 1/32" scale. Manufactured of the highest quality aluminum. Adjusts to 1/16, 1/8, 1/4, 1/2, 1:1, 2:1 and 32.