Is there such a ruler that can be extended up and down, because I want to measure the length as shown in the figure, but the steel ruler and tape measure are not easy to use and cannot be vertical?

Tape measure is a common measuring tool in daily life. What we often see is a steel tape measure, which is often used in construction and decoration, and is also one of the necessary tools for families. Divided into fiber tape measure, tape measure, waist measure, etc. Lu Banchi, Feng Shui ruler and Wen Yi also belong to steel tape measure. Usage: Hold down the button on the tape measure with one hand, and pull out the tape measure with the other hand. Reading method: 1 When measuring by direct reading method, aim the zero scale of steel tape at the starting point of measurement, apply appropriate tension, and directly read the scale corresponding to the end point of measurement. 2. Indirect reading method In some parts that cannot be directly measured by steel tape, steel ruler or square ruler, steel ruler or square ruler can be used to align the zero scale with the measuring point, and the ruler body is consistent with the measuring direction; Measure the distance of a whole scale on a steel ruler or square with a tape measure, and measure the remaining length by reading. The number on the tape measure The number on the tape measure is divided into two lines. One row of numbers is CM /CM, the other row is inches, 1CM is about 0.3937 inch, and 1 inch is about =2.54CM, so the shorter distance between the two numbers is cm and the longer one is inch. The number font per centimeter is less than inches, 100 cm = 1 meter, usually expressed in centimeters. Reference: Baidu Encyclopedia-Tape Measure

A tape measure is usually in centimeters, 10 is 10 cm, and the internal cells are in millimeters, 10 mm = 1 cm, 100 cm = 1 m. The numbers on the tape measure are divided into two rows, one is cm/cm, the other is inch, 1CM is about 0.3937 inch, and 1cm is about =2.54CM, so the shorter distance between the two numbers is cm and the longer one is inch. The number font per centimeter is less than inches,100 cm =1m. Extended information: Tape measure is a common measuring tool in daily life. What we often see is a steel tape measure, which is often used in construction and decoration, and is also one of the necessary tools for families. Divided into fiber tape measure, tape measure, waist measure, etc. Lu Banchi, Feng Shui ruler and Wen Yi also belong to steel tape measure. Methods the tape head is loose, which is convenient for us to measure the size. When measuring dimensions, there are two measuring methods. One is hanging on the object, the other is pushing on the object. The difference between the two measurement methods lies in the thickness of the iron sheet at the head of the tape measure. The purpose of loosening the tape measure head is to compensate the iron piece of the tape measure head when it abuts against an object. The scale of the tape measure is the same as the metric scale of the tape measure. One centimeter tape measure is equal to one centimeter tape measure, except Mongolian tape measure used by black-hearted clothing merchants. The reverse side of the tape measure is the city scale: city scale, city inch; The front of the tape measure is divided into two parts, one is metric scale (meters, centimeters) and the other is English scale (feet, inches). The main type of classified tape measure is steel tape measure, followed by fiber tape measure, which is the tape measure we often see. Many people talk about the amount of cloth, as well as the waist circumference (cutting/measuring all belong to this category). In southern China and Hongkong, the tape measure is usually called a soft ruler or ruler. Its material is PVC plastic and glass fiber, which can prevent the tape measure from being stretched during use. Tape measure is made of glass fiber and PVC plastic, also known as fiber tape measure or soft tape measure. Generally, it is metric, that is, 150 cm on one side and 60 inches on the other. Inch is a commonly used unit of measurement abroad, and the size unit of TV and monitor is inch. Jeans are also measured in inches. In China, tape measures are usually used for city inches. One side is 150 cm and the other side is 45 inches. People often say that 2 feet 1, 2 feet 2 waist is the unit of city inches. Gift rulers are used for advertising. They are divided into steel tape measure (steel tape measure) and leather tape measure (PVC plastic fiber tape measure), which are usually cute and small. Tape measure is also called measuring tool. 85% of the tape measures in the world are exported from China. Reference: Tape Measure-Baidu Encyclopedia

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