... ,shear wave measurement. DZQ6B Engineering Seismograph (Surface Wave Instrument) Realization of Various Seismic Methods; Surface wave, high ... measurement, refraction, shear wave measurement, city blasting vibration safety evaluation, pile foundation testing, etcMain Technical Specifications Computer Configuration: Military ... ×270×190mmWeight: 9kg DZQ6B Engineering Seismograph (Surface Wave Instrument)