The dial shall be made of copper aluminum alloy, inalterable black numerals and graduation on white background. The manufacture of same will be to applicable standards.

仪的刻度盘应为机械指针式，应选用铜铝合金材质，底色为白色，上面标的数字和刻度为黑色（不褪色），刻度分配应采用厂家提供的标准。