photoelectric indicator

例句：

1. 1. The photoelectric indicator is used to detect the presenceof light.
   光电指示器用于检测光的存在。
2. 2. The new sensor has a high sensitivityand can be used in various applications.
   新型传感器具有高灵敏度，可应用于各种应用。
3. 3. The photoelectric indicator was used tomonitor the temperature in the room.
   光电指示器被用来监测房间的温度。