The guide wires are anchored to the floor and roof of the vessel, passing through ring lugs on
the float to keep it from straying laterally.
One of the potential disadvantages of tape-and-float level measurement systems is fouling of the
tape (and guide wires) if the substance is sticky or unclean.
A variation on the theme of float level measurement is to place a small float inside the tube of a
sightglass-style level gauge: