Purpose: 1. It adopts three freedom frame gyroscope structure and new designed digital circuit. 2. It adopts long distance techniques, so it can correct drift automatically. 3. It adopts computer techniques. This highly improves measurement accuracy and reliability. 4. It is suitable to determine dip angle and azimuth angle at multi-points in the magnetic area or in the borehole with casing tube. 5. It is equipped with excellent software, so it is fine to be operated. It can meet requirements of users. Main technical specification and parameters 1. Measurement range and error: (1) Dip angle measurement range: 0～50°; Measurement error: ±0.2°; (2) Azimuth angle measurement range: 0～360°; Measurement error: ±5°; drift: 12°/h; 2. Measurement depth: 1200 m; 3. Inclinometer probe: Φ50 mm;