The sampling pipette includes means for adjusting the volume of liquid to be taken. One apparatus includes a container that is configured to hold froth therein and change at least a portion of the froth into substantially separate liquid and gas portions when an electrostatic charge is discharged through at least a portion of the froth between at least two electrodes at least partially arranged within the container. At least two cables may be releasably engaged with and supported by the cable posts. The list of nodes is determined at least in part based on a path through which the probe message is transmitted from the second node to the third node.