Drilling and Insitu Tests

3 Arm Caliper


The three-arm caliper provides a single continuous log of borehole diameter as recorded by three mechanically coupled arms in contact with the borehole wall. The caliper is a useful first log to determine the borehole conditions before running more costly probes or those containing radioactive sources.

Three-arm caliper measurement is executed in borehole with this system is manufactured by Robertson Geologging.

  • Location of borehole collapse or obstructions
  • Cement volume calculations for grouting
  • Identification of hard and soft lithology
  • Location of cracks, fissures, caving, faulting, casing breaks
  • Correction of other logs affected by borehole diameter


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