FIELD: drilling of directional wells; applicable in determination of position of deflecting tool and well curvature. SUBSTANCE: sensor consists of body with cover, frame of eccentric weight, hemispherical members and arresting levers with grips. Sensor body accommodates drive ensuring reciprocation of periphery pins and central rod engageable with tie-rods. Circular grips and frame end are provided with friction liners to ensure reliable fixing of hemispherical members. Eccentric weight frame has indicator, and angular scale of deflecting tool is installed on sensor body or vice versa. Rigidly installed in body downhole device is sleeve with longitudinal slot and sensor body has spring-loaded retainer for engagement with sleeve slot. EFFECT: extended functional potentialities of sensor due to measurement of the third parameter - position of deflecting tool. 2 dwg
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