Nonmagnetic document ruler offers a tinted guide to aid reading across computer sheets. Use ruler to highlight one line at a time. Design features both Imperial and metric graduations for measuring. Numerals and graduations are sharply delineated. Ruler is made of acrylic that is fully flexible. Use at home, school, shop or office.Nonmagnetic document ruler offers a tinted guide to aid reading across computer sheets. Use ruler to highlight one line at a time. Design features both Imperial and metric graduations for measuring. Numerals and graduations are sharply delineated. Ruler is made of acrylic that is fully flexible. Use at home, school, shop or office.