1.圆形百分表主体 Round mechanical body. 2.表圈转动圈为塑料外圈 Plastic dial adjustable ring. 3.带公差指示器 With adjustable tolerance markers. 4.宝石轴承，机芯防震 Jeweled and shock proof. 5.带表圈紧固装置 With dial locking screw.
