China Suppliers Professional Old- Fashioned Standard Student Drawing Math Compasses

The ruler should not be mixed with a knife or metal stationery. When mixed with a pen, the pen cover must be put on. The ruler has sharp parts. Pay attention when using it to avoid scratching. Be sure to prevent exposure to the sun and long-term sunshine, and keep away from kindling, so as not to affect the accuracy of the measuring instrument and cause danger. It is better not to clean the ruler with a brush.

The most taboo thing about rulers is the scratching and blurring of the engraved value, so rulers become the most protected articles in stationery. The use of rulers should be correct. For example, it is better not to use plastic rulers when delimiting materials, which will easily be scratched. Many people will make a mistake, that is, they will draw the line very fast, and then they will run along the ruler because of the slippery characteristics of the ruler, which will make the value, so the speed is moderate.