GM Series Marsh cyfrowe geofonu Struny dobrej wodoodporności

GL Series Terrestrial Digital Geophone strings GM Series Marsh Digital Geophone Strings Fast detailed description: 1 light weight and distortion 2 good water resistance 3 it’s insulation resistance is no less than 300MΩ in 6 meters even more deep water after 48 hours Description: GM Series Marsh Digital Geophone String are a series of new marsh digital grade geophone strings,GM has good water resistance and it’s insulation resistance is no less than 300MΩ in 6 meters even