What are the length measuring tools?

Common tools for measuring length are: ruler, tape measure, vernier caliper and screw micrometer (also called micrometer). Other scales, such as trigonometry and tape measure, are also commonly used to measure length.

A ruler, also called a middle ruler, has a precise straight edge and is used for measuring length and drawing. Widely used in mathematics, measurement, engineering and other disciplines. Rulers are used to measure straightness and flatness by light gap method, and can also be used to check length and size together with measuring blocks.

Tape measure is a common measuring tool in daily life. What we often see is a steel tape measure, which is a common tool in building installation and one of the necessary tools for families. Divided into fiber tape measure, tape measure, waist measure and so on.

The tape measure can be rolled up because it has a spring. When measuring the length, the length of the ruler and the spring is actually lengthened. Once the measurement is completed, the spring in the tape measure will automatically shrink, and the ruler will also shrink under the action of the spring force, so the tape measure will be rolled up.