Borehole Stressmeters (VW)

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The Model 4300 Vibrating Wire Borehole Stressmeters are designed to measure stress changes in rock and can be installed in boreholes up to 100 feet deep. The Stressmeter consists of a high strength steel proving ring wedged tightly across one diameter inside a borehole and a vibrating wire tensioned across the other diameter inside the stressmeter. Changes in rock stress cause a related change in the resonant frequency of vibration of the tensioned wire providing output which is read by the Model GK-404 or Model GK-405 Vibrating Wire Readouts.


  • Range in Compression¹ : 35 to 100 MPa
  • Range in Tension : 3 MPa
  • Resolution¹ : 2 to 140 kPa
  • Temperature Range² : −20°C to +80°C
  • Borehole Diameter : 4300EX | 37 to 39 mm4300BX | 59 to 61 mm
    4300NX | 75 to 77.5 mm


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