The essentials of using the scale are five meetings , that is

The five meetings are: 1. Recognition. That is, to correctly understand the zero scale, the minimum scale, and the measurement range of the scale;

2. Will put. The scale of the scale should be as close as possible to the measured object, and should not be skewed;

3. Will see. When reading, the line of sight should be perpendicular to the object to be measured and the scale;

4. Be able to read. In addition to reading the digits above the minimum scale, you should also estimate the digits below the minimum scale;

5. Remember. Recorded measurement data, including accurate values, estimates, and units.

1) Recognize. That is, to correctly understand the zero scale, the minimum scale, and the measurement range of the scale; 2. Will put. The scale of the scale should be as close as possible to the measured object, and should not be skewed; 3. Will see.

When reading, the line of sight should be perpendicular to the object to be measured and the scale; 4. Be able to read. In addition to reading the digits above the minimum scale, you should also estimate the digits below the minimum scale; 5. Remember. Recorded measurements, including accurate values, estimates, and units (values without units are meaningless).

Scale. A tool for measuring length. Centimeters or millimeters can generally be read accurately.

Pay attention when using: Check whether the ruler is straight and whether the scale is even. According to the length to be measured and the accuracy needs to choose the appropriate scale.

The "0" line or other integer line should be aligned with the starting measurement edge of the measured object and should be as close as possible to the measurement. If the "0" line is broken, start with another integer line. The line of sight should be perpendicular to the ruler when reading.

The position of the scale on the object to be measured should not be skewed. When reading, a reliable value should be read from the smallest index and then read one digit in the estimation. When using the rear scale to measure, the scale plane of the ruler should be perpendicular to the object to be measured.

Different teachers have different summaries, and I'll now set your three meetings.

Will see. Look at the zero tick line: see whether the zero tick line of the scale is worn, if it has been worn, you should re-select a scale value as the starting point of measurement.

Look at the measuring range: that is, see whether the measuring range of the scale meets the requirements.

Look at the minimum graduation value: The graduation value reflects how accurate the scale is. It determines the accuracy of the scale and the effective value of the measurement.

Volume. The scale should be aligned along the length to be measured, with the zero tick (or other clear scale) aligned with the starting position, and the side with the tick line should be close to the object being measured.

Will read. The line of sight should be perpendicular to the ruler surface, and after the accurate value is read, the next digit of the graduation value should be estimated. Measurement = Accurate Value + Estimate + Units.

Will measure, will see, will read. I don't remember exactly. Anyway, you have to put the scale correctly, you will see it correctly, and you have to read it correctly, and don't forget to estimate the reading.