micrometer with dial indicator

例句：

1. 1.The microscope is used to examine microscopic objects.
   显微镜用于观察微观物体。
2. 2.The micrometer is used to measure the length of a small object.
   微米用于测量小物体的长度。
3. 3. The micrometer is an important tool for measuring small dimensions.
   微米是测量微小尺寸的重要工具。