achromatic indicator

例句：

1. 1. The achromatic indicator was used to measure the color temperature of the light.
   无色指示器被用来测量光的颜色温度。
2. 2. The achromatic indicator was used to detect any changes in the color of the paint.
   无色指示器被用来检测油漆颜色的变化。
3. 3. The achromatic indicator was used to measure the intensity of the light.
   无色指示器被用来测量光线的强度。