Agrowtek PPX Probe Pontoon Water Sensor Float Platform For Sensor ProbesTank Probe Pontoon Float Platform For Hydroponic Sensors In Water Tank The Probe Pontoon (PPX) sensor float platform allows standard 12mm water sensor probes to be floated in water and chemical tanks, deep water culture hydroponic buckets and other bodies of water. The probe pontoon allows sensor probes to maintain continous contact with the liquid while keeping the probes separated and away from the tank walls. Unique design allows for a large stable