What is the Horizontal GeoFlex and how does it differ from the Vertical GeoFlex?

The Horizontal GeoFlex uses the same MEMS sensor nodes as the Vertical GeoFlex but is installed in horizontal casing rather than a vertical borehole. Instead of measuring lateral movement in a borehole, it measures settlement and heave along a horizontal plane. Nodes are still spaced at 50 cm or 2 ft and cumulative deflections produce a profile of the casing. Changes in that profile indicate settlement or upward movement (heave).