JTL-40FW fiber optic gyro inclinometer is a new type of inclinometer adopting high-precision fiber optic gyroscope as the measurement component, which is a high-precision digital drilling inclinometer specifically designed for measuring borehole inclination and orientation at magnetic mines and in iron bushings as well as the high-precision measurement of the vertex angles and azimuths of vertical or directional holes at magnetic mines and in iron bushings. The instrument is widely used in metallurgy, engineering, hydrology, oil, coal field, geology and other borehole logging areas.