4 UNITS OF MEASUREMENT -- This foldable ruler includes inches, centimeters, millimeters and meters. Conveniently measure longer distances than a standard ruler. DURABLE AND EASY-TO-USE -- This ruler is made from durable plastic. It features loosely hinged joints for smooth manipulation. Easily extend or contract the ruler for different distances. COMPACT DESIGN -- Fold up the ruler for easy storage and portability. It fits perfectly inside of backpacks, drawers, desks or pockets. VISUALIZE LENGTH -- Explore scale and measurement concepts. Or, use it to understand the relationships between different units of measurement. CORE CURRICULUM RESOURCES -- LEARNING ADVANTAGE supplies a wide range of teaching essentials. We support educators. At home or in the classroom—count on us for reliable, quality products.