Patent ID: 6845563

Claim:
A device for the measurement of the angle of drift of a borehole that extends from the surface of the ground downwardly into the earth, the device comprising: (i) a generally hollow protective exterior casing; (ii) a microprocessor control; and, (iii) a sensor pack, wherein at least said microprocessor control and said sensor pack are received and contained within said exterior casing, said sensor pack including one or more accelerometers mounted upon a sensor chassis that is positioned within said exterior casing and situated generally parallel to the longitudinal axis of said exterior casing, said sensor chassis having one or more mounting surfaces for receiving and securing said one or more accelerometers to said sensor chassis, said mounting surfaces configured such that said one or more accelerometers when secured to said chassis are held and retained at an inclined angle of from 1° to 450° relative to the longitudinal axis of said exterior casing and said device.