Electrical Single Point Borehole Extensometer

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EDS-71V/EDS-71P is a single point borehole extensometer. It is a key equipment for investigation and monitoring of foundations, slopes, embankments, underground cavities and landslides. This is suitable for 50mm borehole.

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Instrument Name

Borehole extensometer-single point

Sensor Type

Vibrating wire


Available in single point, includes vw displacement sensor


Deformation in ground/ rock mass, such as in tunnel, power house, deep excavation, mines, slopes




50, 100, 150 mm

Key Testing / Calibration

Thermal cycling (-20 to +80°C), thermal variation data, accuracy test, waterproof test for WP version (Sensor)

Key Feature/Advantage

Can be installed in a 50 mm borehole, and at location that are inaccessible

Protection (Waterproofing)


Dimension (mm)


Other Extensometer Products


Electrical MPBX


Soil Extensometer

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