... 4.Wide apllications Float Switch Level Sensor Level Switch Reed Switch Float Ball Float Sensor Stainless Steel Water Level Sensor SFS-1B-45 1 ... can be used to start or close a buzzer for alarm or a led for indication and even directly connected with ... , water dispenser, air-condition, air-cooler, BSD-P, humidifier, dehumidifier,fluid control,a pump,an indicator,an alarm,or other device. If ...