FIELD: mining and construction industry; applicable in determination of borehole crookedness in drilling holes and their further control. SUBSTANCE: device has a source of direct light beam with guide for its orientation in borehole and receiving target for registration of hit of directed light beam. In this case, receiving target has a guide and is connected by flexible mechanical coupling with the source of directed light beam for their combined motion in bore hole. EFFECT: extended field of application of claimed device due to possibility of determination of borehole crookedness in considerably wider range irrespective of depth and presence of bore hole turnings, higher accuracy of measurement and possibility of measurement for prolonged period of time. 7 cl, 3 dwg
