What is the material of the old weighing pole?

When I was a child, I visited the vegetable market and often met people who bought food. They weighed the vegetables with old scales. The old balance beam itself is made of wood, and the material is Huang Huali wood. This kind of wood is also called Dalbergia odorifera and Huang Huali wood. Of course, if Huang Huali is located in the north, it will be difficult to transport, so there are a few old scales in the north that use rosewood and acid branches as imported wood. It is always said that the standard of pole material selection is hardwood. Whether it is Huang Huali wood, rosewood or rosewood, their unified feature is hard, but in the north, it is difficult to produce hard trees due to the influence of climate. In ancient Hainan, Huang Huali wood was used in many occasions, especially for furniture.