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Purpose: The instrument is an inclination measurement instrument of new type, which adopts a high precision fiber optic gyroscope. It can be used to determine dip angle and azimuth angle of vertical borehole or direction borehole in magnetic field or iron casing tube. It can also determine the depth of borehole accurately. It has been widely used in engineering, hydrology, oil field, coal field, and geology for borehole determination. It integrates sensor, power supply device, data processing system together, and it can determine dip angle and azimuth angle of borehole independently in single/multi-point modes. It is not needed to use cable, so there is no trouble to transport heavy winch and cable. It is easy to be operated and portable. It is composed of inclinometer probe, laptop, and electricity charger. Equipped with special software, it can show test data table, and plot plane diagram, sectional diagram, side projection diagram, and space trace diagram. It can print out test data with a printer. Main technical parameters 1. Parameter range and error: (1) Dip angle measurement range: 0~50°; measurement error: ±0.2°; (2) Azimuth angle measurement range: 0~360°; measurement error: <±3.0°; 2. Measurement mode: at fixed points; 3. Data saved: It can save test data of 1000 groups. 4. Electricity quantity: It can determine test data at 80 measurement points once been charged. 5. Inclinometer probe: Φ40×1650 (mm); 6. Borehole to be determined: (1) Diameter: ≥Φ45 mm; (2) Depth: ≤1500 m; 7. Working environment: (1) Temperature: -10°C~50°C; (2) Relative humidity: ≤ 85%; 8. Measurement depth: <1500 m