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Equally Divide is provided with all functions of traditional ruler. In addition the user can define the minimum scale he need. In this way the user can ignore the muddled tick mark that he neednt on the ruler. The tick looks like zebra-stripe and so easy to be recognized.
The power of the ED is provided by the solar panel. At the middle of the ED, there is an electrical display to show the minimum scale that user defined. All these functions is controlled by the idler wheel at the front side of the ED.
Shanghai Normal University