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While we measure the circumference of a cylinder, we should use one hand to hold the disk of tape while another hand holds the tape end. If we need to record the measurement figure at the same time, things will get screwed up. We designed the Circle-tape to deal with this situation. There are some magnetic materials that are set at the end of the plastic film to help stick to metal. Thus, when we are measuring the circumference of a cylinder, we use the tape to go through the cylinder as a circle. This makes it possible to measure such shapes while not needing to put both hands on the measuring tape. It really makes work easier.
Chen Chao, Ye Wenjin, Sui Tingmeng, Xie Yasong