I am looking for a plug&play flow switch (instead of diy because I am not electrical-trained (or safe) person), something that will cut off electricity when the water level falls below certain level.

I did some research and most people had this on their sump tank, but they are using it in the other way, as in it will turn on some device when the water level is low.

Does anyone know where can I get such flow switch in Singapore?

Thank you in advance.