There are various types of rulers used by students, including straightedge rulers, triangular rulers, and curved rulers. A ruler is the most basic tool used to measure the length of straight lines and is essential for students to perform tasks such as drawing and calculating. The triangular ruler has a special angle scale, making it convenient for students to measure and draw angles. A curve ruler is suitable for measuring and drawing curves, meeting the needs of students in special subjects.

The use of teaching scale sets also requires attention to some issues. Firstly, the design of the measuring scale should be scientific and reasonable, with clear and specific indicators and appropriate scales to ensure the accuracy and effectiveness of the evaluation results. Secondly, when using a teaching scale set, teachers should follow the principle of objectivity and impartiality to avoid the influence of subjective assumptions and biases. Finally, the teaching scale set is just one of the evaluation tools and needs to be combined with other evaluation methods and techniques, such as observation, interviews, and work presentation, to obtain more comprehensive and accurate evaluation results.