Beijing earth long Co., Ltd is an high-tech enterprise, with more than 30 years history on development and production of geophysical instruments. Our instruments and technology have won many national, provincial and ministerial awards and achievement, widely used in geological prospecting, hydrology, engineering survey, structure quality testing, fields of earthquake monitoring and prediction, and has passed ISO9001:2000 quality management system certification. Magnetometer contains high-precision proton magnetometer, Tri-component Magnetometer, Fluxgate Magnetometer. Proton magnetometer is wildly applied in much metal ore exploring. MCL -2 is used for prospecting iron ore and underground iron buried. Tri-component Magnetometeris for explored ore, also for detecting magnetic body's azimuth aground or in the roadway Electrical prospecting instrument are mainly DWJ - 3B resistivity & IP instrument with microprocessor, DJF series power supply system (1.5 KW 5KW 10KW three power mode), DD - 25 super power resistivity & IP system, the DUM - 2 multi-electrode electrical imaging system, etc. The power current of supper-power IP system can reach 25A, exploration depth of 500-800m, an effective geophysical prospecting equipment for deep mineral exploration. Applied to civil engineering investigation of geophysical instruments are mainly XG hanging wave logging, SM98 Rayleigh, TB-1 adherence wave logging, XG-2 total wave logging. XG hanging wave logging for domestic exclusive heigh-tech research , get rid of the heavy ground source, realized the automation of wave logging. SM98 Rayleigh wave logging was identified as the domestic leading products By Chinese Land and Source Bureau , which is more suitable for engineering industry with foreign software. Rayleigh vibration system and frequency sounding emitter awarded the Second and third prize by the China Republic Land and Resource Bureau.