NF P94-505-2*NF EN ISO 18674-2:2016 Geotechnical investigation and testing - Geotechnical monitoring by field instrumentation - Part 2 : measurement of displacements along a line : extensometers
1970NF P94-505-2*NF EN ISO 18674-2:2016 Geotechnical investigation and testing - Geotechnical monitoring by field instrumentation - Part 2 : measurement of displacements along a line : extensometers