The carpenter has a tape measure with words on it.

The number generally marked above is centimeters (cm), but the minimum scale value is millimeters; Inches are generally marked below, and the minimum scale is 0. 1 inch. Basis can be distinguished from the distance between two numbers, the closer distance is cm and the farther distance is inches. . The measuring specifications of tape measure are: 1 m,1.5m, 2m, 3m, 3.5m, 7.5m,10m, 20m, 50m,100m, etc. 0..0 hold it down and it will get stuck. Of course, hooks are used to hook the edges of objects, so that one can use the tape measure conveniently. The hook can be moved to measure external and internal dimensions. The first tape measure of 10mm is only 9mm, and the thickness of the hook must be added to reach 10mm, and the thickness of the hook is1mm. It can be said that all movable hooks are better tape measures. Generally speaking, it is centimeters (cm). There are many dialects. This is a city more than inches. The bottom is centimeters. One meter is 100 cm (100 cm) and three feet (30 inches). Another is that the bottom is inches and the label is feet. It's just that a ruler has two scales, the values are the same, but the statement is different. Inches are not commonly used in China, mainly in the south. . The units are (feet) 30.561.91.5122 respectively. Take a few steps at normal school speed, measure the length of each step with a meter ruler, and calculate an average length, such as 70 cm. Record how many steps you took and how long it took you to get to school. You can find the total distance, distance (meters or kilometers)/time (hours) = speed. Find out the diameter of the circle first, that is, fix a point with a ruler, and then rotate the other side to know that the distance between two points is the largest. This is the diameter of the circle, and then mark two points on the diameter of the oil drum with chalk. Put the heavy vertical line on the two points so far, draw a straight line with chalk, so that there are two points on the ground, and then measure the distance from the left end of the upper circular surface to the right end of the ground. A measuring device comprises a measuring tool with an end hook; And a magnetic tool embedded in the end hook. (1). When measuring with the direct reading method, align the zero scale of the steel tape with the starting point of measurement, apply an appropriate pulling force (the pulling force shall be subject to the identified pulling force of the steel tape or the pulling force calibrated on the scale, and measured with a spring scale), and directly read the measured value. Do you want to buy a tape measure or a ruler? You can buy it in hardware store or general grocery store. If it is large, it is recommended to buy it in a large hardware market, which will be cheaper.