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Borehole Stressmeters (VW)

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 Compression 70 MPa
Range in Tension
3 MPa
14 to 70 KPa
Temperature Range² −20°C to +80°C
Borehole Diameter
4300EX | 37 to 39 mm
4300BX | 58 to 61 mm
4300NX | 74 to 77 mm

¹Depends on rock modulus.

²High temperature versions (up to 200°C) available on request.