A tape measure is a commonly used tool in daily life. What everyone often sees is the steel tape measure, which is commonly used in construction and decoration, and is also one of the must-have tools for families. Divided into fiber tape measure, tape measure, waist circumference measure, etc. Luban ruler, feng shui ruler, and Wen meter also belong to steel tape measure.

The tape measure can be rolled up because there is a spring inside the tape measure. When pulling out to measure the length, the length of the ruler and the spring is actually stretched. Once the measurement is completed, the spring in the tape measure will automatically shrink, and the ruler will follow the action of the spring force. Shrink, so the tape measure will roll up.

First, the tape measure is too deformed and will not fail. Why didn't it fail? The mainspring in the tape measure is very long, and its range from fully relaxed to fully tightened is very large. The entire stroke of the tape measure is included, and there is a margin at both ends, so the tape measure will not fail.

Second, there is no difference between pulling one meter long and two meters long; the spring of the tape measure is very thin, and the amount of deformation when it is tightened is also very small, so the reaction force is very small, and the change in force cannot be felt when the ruler is drawn.

The metric scale of the tape measure is the same as that of the tape measure. One centimeter of the tape measure is equal to one centimeter of the tape measure, except for the masked tape measure used by the black-hearted clothing merchant;

The reverse side of the tape measure is the city scale: city ruler, city inch; the front of the tape measure is divided into upper and lower parts, one side is the metric scale (meters, centimeters), and the other side is the imperial scale, (feet, inches).

The numbers on the tape measure are divided into two rows, one row of numbers is in centimeters/CM, and the other row is in inches, 1CM is about 0.3937 inches, and 1 inch is about 2.54CM, so the number with the shorter distance between the two numbers is in cm. The longer one is inches, and the number font in centimeters is also smaller than that in inches, 100 centimeters = 1 meter, and the unit is generally centimeters in use.

The tape measure head is loose, so that we can measure the size. When measuring the size of the tape measure, there are two measuring methods. One is to hang on the object, and the other is to push on the object. The difference between the two measuring methods is the thickness of the iron sheet at the head of the tape measure. The purpose of the loose tape measure head is to compensate for the iron piece of the tape measure head when it is pressed against the object.