1.圓形百分表主體 Round mechanical body. 2.表圈轉動圈為金屬外圈 Adjustable steel dial ring. 3.帶表圈緊固裝置 With dial locking screw. 4.帶緩沖裝置能較好地緩解量桿快速下落對機芯的沖擊 With elastic buffer device inside to protect indicator from shock damage.