... from 1Hz to 100Hz vertical and horizontal direction, DescriptionCDJ Series Digital Seismic Sensor (Geophone) are available frequencies from 1Hz ... consisted three-component geophones, borehole geophone, tomographic imaging geophone series with stable performance, high fidelity and consistent quality in ... data acquisition technologyTechnical Specifications ((20°C) CDJ Series Digital Seismic Geophones