This thoughtfully-designed extra-large calipers is ideal for measuring the diameter or breadth of large and irregularly-shaped objects. Young students will have fun measuring tree trunks, classmates' heads, and other objects in the world around them. The calipers are made of a durable but flexible plastic, and feature hand grips and serrated jaws for taking stable measurements. A white semicircular scale is printed on the axis end, with 0.5cm graduations marked every 2cm. Range: 0-72cm; overall size closed: 19"L x 7.5"W.