Design according to objective needs: you can draw angles, measure angles, draw vertical lines and parallel lines, measure inclination, verticality and levelness at will, make internal and external right-angle crutches, open and close them, make long and short rulers, read them accurately and intuitively, and draw circles with specified sizes.
Products can be made into three types: a small stationery (mainly made of plastic) suitable for primary and secondary school students; Type B teaching AIDS (mainly made of plastic) are more practical for school teachers; Type C tools (mainly made of stainless steel) are used in factories, workshops, carpenters, mechanics, repairmen and so on.
Benefits of protractor:
The protractor has the advantages of wide sources of materials, low cost, simple structure, convenient manufacture, strong practicability, large application market and great investment benefit for manufacturers.
In order to make up for the inconvenience of single use and carrying and keeping the protractor, the method of multi-purpose is generally adopted, which makes the protractor flexible, comprehensive and practical, simple in structure, novel and unique in shape and reasonable in design, thus improving work efficiency and embodying social benefits.