Conductive Foam SensorThe conductive foam sensor makes boiling wort safer, by preventing boil over. This sensor can detect the rising foam in the boil kettle and be used to shut off or reduce the heat source, thus preventing boil over. Electrode 1 is constructed of uncoated stainless steel with a 4 mm diameter Electrode 2 is constructed of coated stainless steel with a diameter of 8 mm Other options are available by special order; please call.