nine-light indicator

例句：

1. 1. This nine-light indicator is used to indicate the position of a light source.
   这个九光指示器用来指示光源的位置。
2. 2. The nine-light indicator was designed to improve the accuracy of the measurement.
   这个九光指示器被设计来提高测量的准确性。
3. 3. The nine-light indicator can be used to measure the brightness of a light source.
   这个九光指示器可以用来测量光源的亮度。