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E-PENCIL is an automatic pencil which designed for architect designers and product designers.Designers need to know the aspect ratio and size when drawing a sketch .It is very difficult to use a ruler to measure them one by one,after using the E-PENCIL,you can roughly know the ratio of the sketch,which lays a good foundation of the latter work.
There is an internal button battery which acts as power .It uses the people's usually subconscious action---pen spinning ---to scroll the wheel, which installed at the end of the pen,to get the battery charged,in which way the battery need not to be changed.
Xie Yasong， Sui Tingmeng， Ye Wenjin， Chen Chao