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Caliper Tools
These tools measure the mean diameter of boreholes. They are used to check the integrity of borehole linings, and where a borehole is unlined to identify zones of washout, breakout or fissures.
For narrower boreholes (<400mm) the 2 or 3 arm calipers give greater resolution than a 4 arm caliper.
Logging Conditions
- 2 – 9 m / min
- Free running
Borehole Conditions
- Dry or fluid filled
- Unlined or lined
Example caliper log showing fractures
in sandstone seen in the optical image