APC OFS’s Six-Arm Caliper tool has independent arms measuring 6 radii of the borehole wall. The 6-arms are spaced at 60 degrees leading to a more accurate measurement of the borehole cross-section compared to 2 or 4-arm tools.

The tool has six independent arms measuring an accurate set of radii via 6 electrical sensors. Borehole diameter is measured by the three sets of opposite arms.