Technical pen
Writing implement designed to make lines of constant width / From Wikipedia, the free encyclopedia
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A technical pen is a specialized instrument used by an engineer, architect, or drafter to make lines of constant width for architectural, engineering, or technical drawings. Technical pens may use either a refillable ink reservoir or a replaceable ink cartridge.
![A technical pen built by Rotring.](http://upload.wikimedia.org/wikipedia/commons/thumb/d/db/Rotring_Tintenkuli.jpg/640px-Rotring_Tintenkuli.jpg)
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Tuschefueller_Staedler%2C_um_1985%2C_zur_Reinigung_demontiert_sx2.jpg/640px-Tuschefueller_Staedler%2C_um_1985%2C_zur_Reinigung_demontiert_sx2.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Rotring_Isograph_0.7_mm_tip_with_scale.jpg/640px-Rotring_Isograph_0.7_mm_tip_with_scale.jpg)