Generally, the numbers on a tape measure are divided into two rows, one row is CM /CM, the other row is inch, 1cm is about 0.3937 inch, and 1CM is about =2.54CM, so the shorter number unit between the two numbers is cm, the longer number unit is inch, and the number font in cm is smaller than inch,1.
Look at some mysterious functions of tape measure.
1. If you look at the tape measure carefully, you will remember that there is a hole in the hook of the tape measure.
So what is it used for? The picture below will make you understand instantly that you can stick to the nail like this, and then you don't need another hand or another person to fix the tape measure for you.
2. The edge of the tape measure hook is not flat, but toothed.
It is used when you need to draw a line where you are measuring, but you don't have a pen in your hand. Hold it down and rub it a few times where you need to draw a line to help you identify it.
3. This position of the front end of the tape measure is movable, and the length of the first grid is generally shorter than that of the second grid. Many people think that the design of this activity will affect the accuracy of tape measure, but in fact, the flexibility of tape measure hook is a very important quality requirement of tape measure.
In fact, if you use a tape measure to measure the outer diameter of an object, you need to pull the tape measure backwards, so that the measurement result is accurate. If you measure the inner diameter of an object, the tape hook itself has a thickness, and then you need to retract this movable distance. This is why the front end of the tape measure should be designed to be flexible.