What is the scale unit of barnyard grass?

The measurement accuracy of barnyard grass is one centimeter, which is equivalent to the current 3 1 and 25mg.

Swallow scale is a kind of small scale, scientific name is Swallow, which is a precision weighing instrument specially used to weigh gold and silver, precious drugs and spices in the old days. Because of its exquisite materials, fine workmanship and unique skills, it is also regarded as a very high-grade collection. In the early years of the Eastern Han Dynasty, the wooden pole scale came into being, which became the premise and foundation for future generations to create scales. China is the first civilized country in the world to implement legal measurement. In the Tang and Song Dynasties, the development of weighing instruments in China became more and more mature, and the unit of measurement was changed from "two baht, labor and millet" to "two money, cents, cents and cents".