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The multipoint borehole extensometer(MPBX) is designed to measure soil and rock movements such as subsidence, foundation settlement, convergence measurement etc.

The extensometer measures the variation displacement between two points: the anchor place at depth and the head placed at the surface. The anchors are placed in different depths. This allows the engineer to distinguish between potentially dangerous deep seated movements and more trivial surface spalling. The rods(invar, stainless steel, fiberglass), which connect the anchors to the measuring head, are inserted into a sliding protective tube.