Cane probes are used to provide overfill detection where a permanent sensor cannot be properly affixed to a tank or rail car.
That is, one or more partitions must be nearly full or you must expect to add enough data to overfill a partition in the near future before you consider resizing.
It is hazardous to overfill liquid storage tanks ; level in the tank must be monitored.
They provide a portable, flexible solution to varying overfill requirements for safe top loading.