FIELD: oil producing industry. SUBSTANCE: device for investigation of formation fluids has mechanical rack-and-gear drive of low pressure, whose gear wheel is located in the body of hydraulic drive. Hydraulic drive rod is made in form of rack carrying linear scale of coarse displacement of rod. Device also has circular scale of precise measurement of rod displacement and attached to output end of fear wheel. EFFECT: higher accuracy of measurement and extended range of investigations. 2 cl, 3 dwg
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