Useful to measure long distances or demonstrate the relationship between circumference and diameter.
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.
The circumference of the wheel measures an accurate meter, and an audible, nonwearing clicking device is activated in either direction with each 1-m revolution.
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