Comes with two different Styles: Counter Style Instructions: • Set the counter to zero and then move the wheel until the needle points to START. The counter will click once and add another number at every full turn. Clicker Style Instructions: Set the counter to zero and then move the wheel until the needle points to START. The clicker will click once at every full turn without indicating any numbers. With theTrundle Wheel you can also: Measure the diameter and circumference of a circle. Find the shortest route between two or more points.
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