double scale

例句：

1. 1. The engineer used a double scale to measure the length of the pipe.
   工程师使用双刻度尺来测量管道的长度。
2. 2. The construction company adopted a double scale system to improve efficiency.
   建筑公司采用了双刻度尺系统以提高效率。
3. 3. The new ruler has a double scale, which makes it easier to read small numbers.
   这款新尺子有双刻度，使读取小数变得更容易。