double caliper

例句：

1. 1. The engineer used a double caliper to measure the thickness of the metal sheet.
   工程师使用双卡尺测量金属板材的厚度。
2. 2. He measured the length of the wooden beam with a double caliper.
   他用双卡尺测量了木梁的长度。
3. 3. The carpenter used a double caliper to mark the centerline of the floor.
   木匠用双卡尺标记地板的中心线。