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This level sensor& water level controller is designed to Onn /Off the water pump.i.e. If your application is to start the water p[ump at low level / stop at high level i auto mode,and if you want Buzzer sound at the empty of water tank in mid level.
then this 'PRECISION' make water level controller is one of the best Automation Controller  for your application.If your low level is completed and pump get start,increases to certain level,If then you need to stop the water pump manually ,you can Off  it..Between low level and high level, pump can be start / off manually.
while draining the water tank when it reaches mid level  going donwards,you will get the alert sound from the Buzzer signally mid level in controller,By push button you can reset the Buzzer and when it comes in low level  ,then pump will start in auto.
Between Low level & High level if power fails , when power comes back you can start the pump manually  from the level only no need to wait for complete drain of the water from the tank.