Inexpensive Liquid Alarm may be placed anywhere. Use it to detect when drums, tanks, flasks, or beakers are close to overfilling. It’s the perfect reminder for unattended filling of any container. The moment a solution touches the sensor, the alarm sounds and a red LED light flashes continually until the liquid no longer touches the sensor. Place the sensor on the floor to detect spills. It allows taking action before a serious situation develops. A loud, high-decibel alarm sounds and a red LED light flashes until the sensor is removed from liquid. Constantly alarms for over 30 hours.