Desc:Land Cased Geophone 4.5Hz for HVSR and Surface Waves Acuqistionis a long coil travel version geophone, which is equivalent to SM-6 B coil 4.5hz geopho...
Desc:Land Cased Geophone 4.5Hz for HVSR and Surface Waves Acuqistionis a long coil travel version geophone, which is equivalent to SM-6 B coil 4.5hz geopho...
