Generally, there should be various measuring tools, such as tape measure, measuring rope, etc. In addition, there are general meter rulers and triangle rulers.

As far as volume is concerned, there are various measuring cups.

There are also general three-dimensional graphic models and three-dimensional models of commonly used units (such as 1 cubic meter, 1 cubic decimeter and so on). ).

There are also quality-related models, molds and so on.