Electro-mechanical Borehole Extensometer provide both mechanical & electrical output and are used to monitor displacement or deformation in soil, rock and concrete structure at various depths using rods of different material and lengths with reference to the instrument head in two forms i.e. Mechanical and Electrical.

The Electro-mechanical Borehole Extensometer of PMT has been designed to measure the deformation in soil, rock and concrete structure at various depths by mechanical readout as well as electrical readout simultaneously. It consists of anchors, rods, protective tubes and a potentiometer sensor. The anchors coupled to the rod are installed in the borehole. The anchors and anchor rods referenced to stable ground, move up or down as movement in borehole occurs. The head of the extensometer can be configured for manual reading using a depth gauge and electronic reading using electrical readout unit.