Beijing Liuhe Greatness Technology co.,Ltd. is one of the leader companies in China, we have 40 engineers in the R&D and we developed and manufactured several drillilng tools and equipment such as Near-bit, Resistivity, DDM,PWD, Fiber Optic Gyro, Continuous Fiber Optic Gyro,Gyro while drilling, MWD, HTHP MWD, Directional sensor, Gamma sensor, Accelerometer, Battery, Dewar flask (Vacuum bottle)