... DZQ12/24/48 High Resolution Seismograph (Shallow-Layer Seismograph) DZQ 48 High Resolution Seismograph is a real 24-bit digital seismic instrument ... , it is a leading seismograph multi-function, high accuracy, high speed, high reliability, good man-machine interface features and scalability ... rock mass elasticity parameters, etc DZQ12/24/48 High Resolution Seismograph (Shallow-Layer Seismograph)