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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.

Specifications

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