|Standard Range||up to 300 mm nominal|
|Least Reading||0.025 mm|
|Borehole Diameter||76 mm or over|
|Maximum Length||100 m|
The Model A-3 Multiple Point Rod Extensometer is the preferred design for installation in downward directed boreholes which are easily filled with cement grout. Up to eight anchors can be installed, at various depths, in a 76 mm diameter borehole providing the capability to locate multiple failure planes and zones of movement.