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Hand-drawn graphic is a kind of necessary skills for engineers, even though lots of people make graphic by computer. However, it might meet some problems when engineers do that by a normal pen. For example, even the experienced engineers would feel difficult to control the space in the same size to meet the professional drawing standards.
This dashed pen is just designed to solved that problem . There are three different buttons on the pen. Each button has a nib corresponded. You can use the nib to draw different kinds of dashed line by pressing the button.