1, Ruler: Rulers have precise straight edges, which are used for measuring length and drawing, and are widely used in mathematics, surveying, engineering and other disciplines.
2. Triangular ruler: also known as triangular plate, it is a common drawing tool. Usually divided into right triangle or isosceles triangle, it is convenient to draw parallel lines or vertical lines.
3. Tape measure: Tape measure is a tape measure made of varnished cloth and soft cloth, which is mainly used for construction site measurement.
4. Vernier caliper: a measuring tool for measuring length, inner diameter, outer diameter and depth. The vernier caliper consists of a main ruler and a sliding vernier attached to the main ruler.
5. Level: Level is a measuring instrument that uses the principle of liquid level to directly display the angular displacement with the bubble of level and measure the deviation degree of the measured surface relative to the horizontal position, vertical position and inclined position.