• Can be deployed with any drilling system, either on land or on water
  • The torque measurement may be positioned down hole immediately behind the vane, eliminating any rod friction effects
  • Computer controlled rotation motor ensures precise rate of rotation
  • Geared, electric motor system rotates the rods at a constant operator controlled rate


  • The EVST has a proven track record as an extremely accurate tool for measuring Su compared to manually operated techniques
  • Automated system ensures a high quality and repeatable result
  • Far exceeds the requirements of ASTM D2573
  • Excellent resolution (0.05 kPa or less)


  • Excellent for profiling shear strength when used in combination with the CPTu or full flow penetrometer
  • Site specific correlations are frequently developed by carrying out adjacent CPTu soundings and EVST boreholes