What kinds of rulers are there? What kinds of rulers with pictures are there?

Ruler, tape measure, steel rule, vernier caliper, micrometer, etc. Ruler: Ruler, also known as interval ruler, has precise straight edges and is used for measuring length and drawing. Rulers are widely used in mathematics, measurement, engineering and other disciplines. A ruler with a precise ruler. 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. Divided into fiber tape measure, tape measure, waist measure and so on. 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. Lu Banchi, Feng Shui ruler and secretary also belong to steel tape measure. The main type of tape measure is steel tape measure, followed by fiber tape measure, which is the tape measure that everyone often sees. Many people say it's a cloth tape measure and a waist tape measure.

Steel ruler is a long ruler made of thin steel plate, which can be rolled into a metal round box, so it is also called steel tape measure. The width of the ruler is about 10 ~ 15 mm, and the length is 20m, 30m and 50m. Steel straightedge has high tensile strength and is not easy to stretch, so it has high distance accuracy and is often used in engineering survey. A steel ruler is a steel tape measure. The steel rule is basically divided into centimeters, and every meter has digital remarks, which is suitable for general distance measurement.

Vernier caliper is a measuring tool for measuring length, inside and outside diameter and depth. The vernier caliper consists of a main ruler and a sliding vernier attached to the main ruler. The main ruler is usually in millimeters, while the cursor has 10, 20 or 50 scales. Vernier calipers can be divided into 10-degree vernier calipers, 20-degree vernier calipers and 50-degree vernier calipers.

Outside micrometer, also called spiral micrometer, is often referred to as "micrometer" for short. It is a more precise length measuring instrument than vernier caliper, with the accuracy of 0.0 1mm, 0.02mm and 0.05 mm, and with the estimated 1 bit, it can be read to the third place after the decimal point, so it is called micrometer.