Borehole Deformation Gauges


The Model 5000 Borehole Deformation Gauge is the proven USBM-style gauge used to measure in situ rock stresses using the overcoring technique in rock that is competent and elastic. The measurement of in situ stresses is important in the design of underground openings such as power houses, crushing stations, mines, tunnels and the like. It is also useful for determining the inherent stability of pit slopes, foundation excavations, mine pillars and dam abutments. A full line of ancillary equipment is available including readout units, biaxial modulus chamber setting rods, etc.


  • Borehole Diameter : 38 mm EX-size diamond drill hole
  • Resolution : 1.0 µε
  • Minimum Overcore Depth : 203 mm (25 mm with reverse case)
  • Maximum Overcore Depth : 15 m standard (60 m with extra cable)
  • Temperature Range : −20°C to +80°C
  • Length × Diameter : 267 × 35 mm


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