The B series seismic geophones are mainly used in petroleum exploration. The series have a wide frequency band and high spurious frequency. The tolerance of all parameters is controlled within ±5%. The B Series has good stability, high accuracy and a stable signal. Its unique double coils structure considerably lowers the distortion, the coil can circumvolve freely within 360° this effectively eliminates surface disturbance. Thus creating superb S/N, little phase displacement and high dynamic performance. Its good temperature adaptability makes these series suitable for many different fields within the seismic exploration industry.And this can be exchanged with SN-4.