Borehole Extensometer


The Model A-1 Single Position Rod Extensometer is a very simple, rugged and reliable instrument, easily installed and completely recessed within the borehole for optimum protection. The Model A-1 is a natural first choice for monitoring the safety in and around tunnels and mine openings.

Options are also available with electrical transducers for remote readout and/or continuous monitoring (please contact us for details).


Standard Range up to 100 mm
Least Reading 0.025 mm
Borehole Diameter 35, 44, 51, 64 mm
Maximum Length 10 m