The instrument is used in borehole attitude survey to provide parameters such as inclination, azimuth, megnetic intensity and so on. The data processor with built-in high speed microprocessor can caculate accurately and display real time parameter gotten from survey. The rechargable battery can work for 15 hours continously. The instrument uses pulse modulation technique and transmits signal and supplies power through core cable. The winch uses direct current timing montor, with the function of arranging ropes automaticly and showing depth and speed. Because of good crushing resistance and leak proofness. LHE2700 serial products don't need outer protective barral and can be used in borehole survey beneath 2000 meters.