float water level indicator

例句：

1. 1.The float water level indicator was used to monitor the water level in the lake.
   浮水指示器用于监测湖中的水位。
2. 2.The float water level indicator is essential for ensuring the safety of the boat.
   浮水指示器对于确保船只的安全至关重要。
3. 3. The float water level indicator can be used to indicate when the water level has reached a certain point.
   浮水指示器可以用来指示水位达到某个特定点。