Loading... Please wait...


Borehole Stressmeters (VW) | Model 4300

  • Model 4300EX (front), Model 4300BX (center) and Model 4300NX (rear) Vibrating Wire Stressmeters.
  • Model 4300 details and installation tool assembly.
Model 4300

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
2 to 140 kPa
Temperature Range²
−20°C to +80°C
Borehole Diameter
4300EX | 37 to 39 mm
4300BX | 59 to 61 mm
4300NX | 75 to 77.5 mm

¹Depends on rock modulus.

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

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.