Chartpak Adjustable Triangular Scale Aluminum Engineers Ruler, 12", Silver
Designed for the exacting needs of engineers. 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. Manufactured of the highest quality aluminum. Adjusts to 10, 20, 40 and 50 parts to the inch.
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