... subgrade (roadbed), cave surveying, etc.Quality Inspection of Civil Engineering; Bridge pier and building pile foundation detecting, etc. ... full waveform noise monitoringSupport multiple (at Windows interface) processing software: Superficial reflex processing, refraction, surface wave shear wave ... : Every six channels as a group, optionally chosen by software: 64 times (36dB), 16 times (24dB), 4 times ...