Description
Useful to measure long distances or demonstrate the relationship between circumference and diameter. The circumference of the wheel measures an accurate meter, and an audible, non-wearing clicking device is activated in either direction with each 1-m revolution. Wheel edges grip smooth surfaces, preventing slippage as the wheel rolls. A sturdy, plastic handle enables the user to walk while rolling the wheel. The scale is graduated in 1-cm divisions. Approved by the Canadian National Metric Council.