Baoding Earth Science & Technology Co., Ltd(EST).which belongs to JIUJIU Group, is a high-tech enterprise registered in the national high-tech zone .The company is specializing in producing and developing geophone, cable ,seismic exploration instrument etc. and has an Engineering Department of over 30 years combined experience. It utilizes the latest technology equipment and most advanced techniques to ensure that all the products offer consistent quality .Its annual production of geophone is over one million pieces. EST?? series products have been widely used in oil, gas and coal exploration and national defense monitoring etc. EST main products are as following: EST-20DX series geophone, EST-20DN series geophone, EST-20DC super series geophone, EST-20DS super series geophone, EST-20DG high sensitivity series geophone, EST is an ISO9001 Quality System Certified Enterprise .Its products have passed the verification, calibrations, examination of China National Petroleum Corporation. Its annual production of geophone is over one million pieces. EST consistently adhere to the quality principle of ?IMPROVE QUALITY AND SEEK TO BE OUTSTANDING? and the quality aim of ?BETTER THAN NATIONAL STANDARD,BEING THE LEADER OF INDUSTRY.? EST always implements the principle of ?EST SEEKS TRUTH AND HIGH TECHNOLOGY? and procide precise equipment and satisfied service for the clients.