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EDS-91V/H magnetic extensometer is used to measure vertical settlement or lateral movement depending on the application. Settlement or heave at various levels within a soil mass may be assessed by monitoring location of magnetic targets which have been positioned over a near-vertical access tube.


The magnetic extensometer system has been designed to measure settlement or heave of soft ground under the influence of loading or unloading due to construction of embankments, fills, buildings, and structures.

Extensometer 91VH

  • Reliable, accurate, low cost and simple to read

    • Any number of points can be monitored

    • Probe is portable and can be used at many access locations; only the access tubes and magnets are permanently installed

    • Options available on type of probes, access tubes and magnet assemblies

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