Measuring Wheel / Measuring Disc

How to Use:This measuring wheel has a circumference of 20cm and will click on each revolution. This product is good for measuring along curves but works well for straight lines too. Start with 0 at bottom and the beginning of your measurement, roll along the object you are measuring and keep track of the clicks. If the object you are measuring clicks 7 times and the end of the object is at the 17 mark the measurement would be (7x20)+17=157cm. Tips for Success:Start with 0 straing down on your beginning markPress down with moderate pressure (especially if not using an O-ring option)Keep perpindicular to you object you are measuringOptional Bill of Materials:608 bearing - common bearing used for fidget spinners and skateboards O-Ring - You can use the largest O ring in the SAE (Part 327) or Metric (Part P-48) Storehouse O-Ring assortment. Below are the harbor freight links but they are also available at on Amazon and other hardware stores. Harbor Freight SAE: https://www.harborfreight.co