One thing for two purposes, it is tape and ruler.
Usually, when we need a ruler, we often can't find it. Are you upset?
One day, I put the adhesive tape on the table for a long time, and suddenly came up with this design idea of superfluous. Its advantages are not only when normal adhesive tape is used to stick articles, but also when it is pasted to any place where I want to stick it as a measuring ruler, such as on the edge of the table/on the notepad/on the wall/on the counter, etc. It can be easily found when measuring, and it is extremely.
The habit of measuring/reading starts from 0/10/20... so the ruler line is specially added in multiples of 10, which is still easy to read after cutting.