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Gyroscopic Verticality

The gyroscopic verticality probe acquires borehole inclination/azimuth logs in situations where metal casing or magnetic materials around the borehole prevent use of the standard verticality probe. The 3D-magnetometer version also acquires 3D-magnetic data for location of magnetic ore bodies.

Principle of Measurement:

The standard probe includes a gimbal-mounted directional gyroscope for orientational measurement and two accelerometers for inclination. In the 3D magnetometer probe, an additional triaxial fluxgate magnetometer continuously measures X, Y and Z magnetic components. These are used to compute the magnitude and direction of the magnetic field around the probe.


  • Continuous log of borehole inclination/azimuth
  • Not influenced by metal casing or magnetic materials
  • Low drift compared to ‘rate’ gyroscopes
  • Natural-gamma measurement
  • Magnitude and direction of surrounding magnetic field


  • Borehole inclination
  • Borehole drift
  • True vertical depth
  • Natural gamma
  • Magnitude and direction of surrounding magnetic field


Water / Minerals / Engineering

  • Verticality measurements in steel casing or in the presence of magnetic ores
  • Detection of nearby magnetic ore bodies (3-D magnetometer probe)


Diameter: 44mm
Weight: 12kg
Temperature: 0-70⁰C (extended ranges available)
Max. pressure: 20MPa
Inclination range: 0 to 30°
Azimuth range: 0 to 360°
Magnetometer range: +/-100 μT

Operating Conditions

  • Borehole type: open/cased hole; water/air-filled
  • Centralisation: required

Sales Information

I002150 Gyroscopic verticality probe with natural gamma
I014559 Gyroscopic 3D-magnetometer probe with natural gamma

Download Gyroscopic Verticality sheet


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

Robertson Geologging Ltd., 2017

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