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The RG verticality probe provides accurate, continuous measurements of borehole inclination and direction. These are output directly as log traces or may be processed further to produce tabular and graphical outputs of borehole position, borehole drift and true vertical depth.

Principle of Measurement:

The probe includes a triaxial magnetometer to determine the bearing of a reference in the probe relative to magnetic North and three accelerometers to measure inclination. The outputs from the transducers are processed by a downhole microprocessor to give final borehole inclination and azimuth data in real time.


  • Small diameter for slimhole operations
  • Continuous borehole orientation log
  • Suitable for all borehole inclinations and directions


  • Borehole inclination
  • Borehole direction
  • Borehole drift
  • True vertical depth
  • Natural gamma



  • Bed-thickness estimation
  • Surveying and deviation checks
  • True seam depth


Diameter: 42mm
Weight: 7kg
Temperature: 0-70⁰C (extended ranges available)
Max. pressure: 20MPa
Inclination range: Horizontal +/- 90°
Azimuth range: 0 to 360°

Operating Conditions

  • Borehole type: open/plastic-cased, water/air-filled
  • Centralisation: non-magnetic centralisers required

The operation of the probe is limited in steel casing or in the presence of magnetic minerals which affect the magnetometer. Under such conditions, only borehole inclination (without directional information) can be logged. The gyroscopic verticality probe should be used in preference to the standard verticality probe in such cases.

Sales Information

I002141 Verticality probe with natural gamma


Download Verticality sheet


...Practical Innovation with Global Service & Support...

Robertson Geologging Ltd., 2017

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