You Can Use It To Draw A Straight Line, Or To Measure, Or To Magnify, Or For All Three! This Handy Clear Ruler Is Also A 2x Magnifier. Great For Home, Office, Or School. You're Going To Love It! 30cm Long.* Clear Acyrlic * 11 13/16" (30 CM) Long * 2x Magnification Power * Great For School * Use At Home Or Office