The Encardio-rite model EDS-70V multi point borehole extensometer is a precision instrument designed to help civil engineers and geologists in the measurement of deformation of rock mass & adjacent or surrounding soil.
 
Together with anchor bolt load cell and tape extensometer, it is essential equipment for investigation & monitoring of foundations, slopes & embankments and for studying the behavior of rock around underground cavities, tunnels and mines. The borehole extensometer is an important instrument especially in investigation of underground cavities & landslides.