Today I met a foreign client who bought a mechanical scale, he said he wanted to buy good quality teaching equipment, but he didn’t want students to use it for a hundred years. I also expressed the hope that the material would be safe and durable, that it could be made larger, and that it would be more convenient for visual observation, and that the volume and weight would not be too large. When selling products abroad, the volume of the container is only 68 cubic meters.