By changing the cross section of the ruler, avoid getting pen and ink when the ruler is used, which will stain the paper or hands. At the same time, the improved section is also conducive to people picking up the ruler.
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The design of the ruler still cannot effectively improve the problem of dirty paper with ink, if only it could be considered from the ink.
The cross section of the inverted isosceles trapezoid solves the pain point that is difficult to pick up, but don't you find that if the reverse buckle falls off, that is, the longest bottom of the isosceles trapezoid is on the ground, how can you take it? Push hard?
It solves one pain point and brings another disadvantage.
In fact, I have seen this a long time ago.
The man-machine was considered, the pain points were considered, but the actual situation of use was not considered.
There will be inaccuracy
The whole is very simple ~
The lines are not allowed to be drawn.