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It is difficult for a traditional ruler to accurately measure an object longer than its own length, and the ruler is thin and inconvenient to pick up from the desktop. The ruler named "limitless" we designed has a groove at the bottom of the ruler for easy picking up. The two rulers are connected in a jigsaw manner, and they are used alternately and continued to measure longer lengths. Make the ruler measurement more accurate, more convenient to store, and enhance the fun in use.