What is the scale on the tape measure?

The numbers on the tape measure are divided into two rows, one is cm /CM and the other is inches.

1CM is about 0.3937 inch, and 1 inch is about =2.54CM, so the shorter number unit between two numbers is CM and the longer number unit is inch. The digital font in cm is also smaller than that in inch, 100 cm = 1 m, and the commonly used unit is cm.

Extended data:

1, measurement method

The tape head is loose, so that we can measure the size. There are two ways to measure dimensions with a tape measure. One is hanging on the object, and the other is propping on the object. The difference between these two methods lies in the thickness of the iron sheet at the head of the tape measure. The function of loosening the tape head is to compensate the iron sheet at the tape head when the tape head abuts against the object.

2. Stress of tape measure

There is a small piece of steel in the "inner core" of the tape measure, which acts as a spring. There is a folded part in front of the tape measure, which works at this time, so that the tape measure is stuck outside, so that it will not be completely retracted. At first, it was loose, but after pulling it out, it became tight. There should be a recovery process after letting go, so it will bounce back automatically.

References:

Baidu encyclopedia-tape measure