How to use the scale

1, first observe the zero scale, measuring range and dividing value of the scale.

2. Correctly place the scale: when measuring, the scale should be along the measured length, and the marked side should be close to the measured object, so that the zero scale or a whole scale of the scale should be aimed at one end of the measured object (starting from the zero scale line without wear).

3. Correct reading: When reading, the line of sight is facing the scale and perpendicular to the ruler surface, so the next digit of the scale value should be estimated; If the measured object is not aligned with the whole scale, it should be filled with zero. For example, the length of an object measured with the millimeter scale is aligned with the10mm scale, and the reading should be 30.0mm or 3.00cm..

4. Correct record: the measured value consists of accurate value, estimated value and unit.

Note: the accuracy of measurement is determined by the minimum scale of the balance, regardless of the measurement unit used.

Extended data:

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.

"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.

One of Lu Ban's inventions is that he can correctly draw a right triangle, also called a class ruler, and can tell craftsmen which sizes are irregular and which ones are unlucky according to the rules of divination (geomantic omen). These rulers are still available.