Ohto Promecha 1000P Drafting Pencil - 0.5 mm
Features available in earnest comes with as drafting. Pen tip is using a three-stage taper lines or characters to make it easier to look at the time of writing. You can adjust the length of the guide pipe by turning the body front axle. Can be adjusted up to 4.0 ~ 1mm up to the length of the guide pipe to match the thickness of the ruler. I'm supposed to knock the cover mechanism can display the hardness of the core.