What kind of ruler should I buy in grade one?

It would be nice to buy a ruler with straight lines and wavy lines in grade one.

Introduction of ruler:

Rulers, also known as rulers and scales, are tools for drawing line segments (especially straight lines) and measuring length. There are usually scales on the ruler to measure the length. Some rulers have holes with special shapes, such as letters or circles, which are convenient for users to draw. They are usually used to measure and calculate the length, and are generally divided into tape measure, vernier caliper, ruler and ruler.

Type:

The snake ruler is a ruler specially used to draw curves. Triangular ruler is a ruler of right triangle or isosceles triangle, which is convenient for drawing parallel lines or vertical lines. Slide rule: a calculating tool. Soft ruler: it is often used to measure human body parts. Ruler: used to measure buildings, furniture, etc. Vernier caliper: used to measure smaller things.

In ruler drawing, ruler is regarded as a tool for drawing infinite straight lines. Level: Level is a measuring instrument that uses the principle of liquid level to directly display the angular displacement and measure the deviation degree of the measured surface relative to the horizontal position, vertical position and inclined position.

Production:

Rulers used in different occasions have different requirements and standards. If more accurate values are required, then higher technology is needed, and they must be produced by machines. Besides the accuracy of numerical value, the second key point is the quality of engraving value. Generally, a protective film will be branded after the value is engraved.

The third point is the choice of materials, which are currently divided into plastic, metal and wooden rulers. Plastic rulers are mainly used by ordinary students to make stationery, metal rulers are more industrial, and wooden rulers are mainly used for teaching.

Daily protection:

The most taboo of ruler is scratching and blurring the engraving value, so ruler has become the most precious item in stationery. What should I pay attention to when using a ruler?

1, first of all, use the ruler correctly. For example, it is best not to use a plastic ruler when delineating materials, which will easily scratch. There are also many people who will make a mistake, that is, they will draw lines quickly, and then they will draw along the ruler because of its slippery characteristics, which will blur the graphics, so the speed is moderate.

It's best not to mix the ruler with the knife or metal stationery. When mixing with pens, be sure to cover the pen cover.

The ruler has a sharp part, so you should pay attention to avoid scratching when using it.

4, be sure to prevent exposure and long-term sun exposure, away from the fire source, so as not to affect the accuracy of the instrument and cause danger.

5, it is best not to clean with a brush, which means try not to dirty the ruler.